hey all. Question here. I have a 77 Cutlass. Did the headers and exhaust. Going to be putting on my new cam and rpm intake. Also will be doing rear gear 3.73. Currently on the almost stock engine the PO installing a refurbished quadrajet. Seems to run pretty good. I have a new Summit racing 600 cfm carb. I have already jetted it and I know these carbs well unlike the quadrajet. I am leaning towards using the Summit carb untill the spring when I'll be able to do the holly sniper efi. I wanted to ask your thoughts. Thanks you

 

Keep the QJet for now.

750 cfm QJet vs a 600 cfm whatever model the other one is.

Throttle linkage / cable is already set up for the QJet.

 

The qjet can be a fantastic carb, with the right knowledge and investment (time and/or money).
But if you're in a pinch and the qjet isn't working well, then the summit carb is probably a fine short term band aid.

FWIW, dollar for dollar, I'd rather invest in a good qjet setup (rebuild by a good company, time spent learning how to tune it, investment in parts) than a TBI. A perfectly running TBI will run marginally better than a carb (other than cold start. Yippee.), while an average TBI is far worse than a good carb.

 

If the car is running with the Qjet then just keep driving it. If you want to put EFI on it later then do your research and make sure you get the right one. No need to swap to the Summit carb you have unless the Qjet is giving you trouble.