71 valiant engine build, which carb to use

318willrun said

the factory put 950 cfms on a 340 on the show room, not even headers. Factory also put 800 cfm Thermoquads on stock 318's with single exhaust. I've done carb swaps at the track for testing. Click the link right below in my post and watch my very mild, low compression 318 with 318 heads run with 1200 cfms of carb on top, no headers, 2.76 gears and stock converter. My opinion again, 800 and don't look back.

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Don't you understand what carburetors are rated at and the signal given by the engine you're not flowing 1200 CFM.
You edited your post and i guess i wasn't fast enough to login and quote you, you said 6 pack at 1st not 950cfm, which is more like 955cfm
Just imagine if 1200 cfm were being digested ...you're only running 13's ??
The 318 thermo... well they made many cfm rating for those and the primary is so tiny 'stronger signal=more mixing of fuel and air... that it can run that big carb, BUT it is not even opening the secondary all the way... that air door is for a reason.
You're not an idiot, but you have a sort of confident incompetence about you. You would run faster with one 4 brl than the intake and dos 600's , even a couple 390's.
Always amazed how when something runs good enough for somebody...they think it's perfect. They could be horsepower ahead and better milage.