Ok I still have an issue with the throttle. I am running an HEI distributor (MSD to be exact) I have flat top Pistons running 9.5.1 compression. The cam lift is .456, duration is 268 degrees, and rpm range is 1500-5500. I have an edelbrock 750 with an electric chock. I got brand new 8mm plugs wires with ngk plugs. I changed the timing 2 times. I looked at everyone's opinions and set it high and low. When I set the timing to 36 overall. Sounds and runs nice, but has a terrible throttle response and under power wants to bog down and not go. With high timing, it is a lot more responsive, with a noticeable lag in the beginning, and a small misfire at a steady rpm. I'm lost and don't know what to do? Anything?

 

Did you disconnect the vacuum advance when you set your total? What is your idle timing? Is your HEI hooked to full battery voltage?

 

It's running between 18-22 with vacuum advance unhooked.

 

It should be plenty responsive with that timing. If your looking into the carb with the engine off, is your throttle opening all the way with the accelerator pedal to the floor? Are you getting 2 solid streams of fuel spraying in there when manually pump the throttle linkage.

For the misfire while cruising you may be getting too much vacuum advance at low load cruising.

 

See I'm confused, because it should run excellent at 20 timing with the advance unhooked, and around 36-40 total. It runs awesome and sounds really nice. But with that timing, the throttle responds about half way down on the gas pedal and once it starts to go it bogs down like it's not getting gas

 

Maybe its the chock? Just kidding

 

Lol, yea im confused

 

edelbrock 750

I never cared for them, Get a Q J.

Johnny

 

Did you just install the hei ? A common mistake is not running 12 volts .points ignition starts up on 12 volts then cuts back to 8 or 9.
Railguy

Sorry I saw where someone already ask about the voltage. I had a problem like this turned out to be the transfer slot and the throttle being to far open at idle. I drilled a small hole in the primary throttle butterflies also drilled out the restricter plug in the metering block.l'm running a holley though. You should look up" transfer slot" in a edelbrock book.
Railguy

 

I haven't checked the voltage to the HEI yet, would that actually cause the car to bog and lag so much under power? It really feels like it's not getting gas, I have two solid streams of gas under throttle so I don't know what else to check. It just really seems like it's starving for gas

 

Before I did the work to my carb it had a bad stumble off idle. I would give it a little throttle and let the clutch out slow and it just died. It was not that bad with the auto trans but was really hard to drive with the 5 speed. I have a lot to do today but I ll try to get some information to you. I know I have a holley but all carbs work pretty much the same.
Railguy

 

Perfect! Good luck thanks

 

http://www.google.com/search?q=holle...ZOl2GZljSFg%3D
Here's a link to a pic of the transfer slot. On the left is the situation I had I drilled a small hole in the primary butterflies which allowed me to back off the idle screw and keep the same rpm and put the butterflies down where they should be . next was to drill the restricter out a little to get more fuel to the slot. One thing I noticed when I adjusted the idle screws the more I turned them out "richer " the better it got to a certain point then it didn't make a difference. Because the restricter was too small.
But before you go doing anything to the carb make sure you have 12 volts to distributor.
Railguy

 

http://m.ebay.com/itm/How-to-Rebuild...518?nav=SEARCH
You need this book . I have a carter book and your carb is a lot different than my holley. The problem I had was the idle system is like a small carb that works independent of the main system when you open up the throttle you switch from small carb to the main the transition slot helps make the transition by adding more fuel but if you are using too much of the transition slot on idle. When you press on the throttle you don't get enough fuel before the main system can start to work. Hope this helps.
Railguy