How much HP...again

carb is way to small for the heads and roller cam 800 dp 850 dp
71 340 came with 800 cfm its the fastest stock 340 should be all you need to know
your cam and heads demand more carb
I agree, but a 750 cfm carburetor is all a 340 needs in this combo. 800 was overkill for a stock 340. imo