I'm running a 70 cuda with a 340 4 speed I have a holley Carb 750 on it now.
I have a LD340 1inch spacer.

Running X Heads Have a purple cam 280/ 484 108 centerline 50%

Have TRW Pistons H-Beam Rods Stock Cam I built the engine for the

street. with low end torque DONT HAVE THAT NOW. My Int settings are

18 and final set 35 total When i purchased the carb from a freind rebuilt it for me. Just never has the low end i would like. In fact it was very hard to spin tires at stop. Also running a 3/8 fuel line

Any Idea's Thanks Kevin this has been a 2 year problem.