Hello!

Just bought myself nice 70 olds 98 with 455 rocket and I'm getting to know it better (I have few 196x mopars and ford)

I wanted ask about that device near throttle linkage ? It is not connected to anything special here, have spring and pushing throttle linkage.

Idle speed screw is different place and I'm confused what is the purpose of this device.​​​​​​​

 

It's called a dashpot. It is supposed to slow the throttle when backing off quickly so the engine doesn't die. Good news is you have the correct carb for your car.
Welcome to Classic Olds.

 

Thanks for clearing that out! Make sense.
So much smart functions on that carb - like choke pulloff (which is disconnected - I guess there was a vacuum leak and they plugged it) which back off choke a little when stomping on throttle.Never seen this kind of stuff in my 196x mopars

And yes that is 7040251 RJ carb. Car have only 35000 miles and it is in really good condition. Car have some aftermarket engine parts and they work but I will be reverting some back to stock parts. I like them stock

 

Beautiful.

 

Wow, that’s a clean 54-year old. Happy Motoring!