This motor is a nightmare

[ben88]

Hey Yall,

My name is Ben and I currently attend Long Beach state studying mechanical engineering. I am the proud owner of a 68c10 Stepside. A couple of years ago my dad and I swapped the 6Cyl. to a SBC 350 and I was able to get a muncie at a steal, so really not a bad setup. However, ever since I swapped the engine, I have never had a good running motor. The engine was rebuild by a engine builder in Bakersfield, then I installed a comp cam extreme energy 274, Edelbrock performer eps manifold, headers, Edelbrock carb. Even after the rebuild the engine did not run properly, so therefore I purchased a new Carb (625 electric choke) and MSD distributor (HEI replacement). At this point the only part that is still the same as before the engine was rebuild is the intake, so I bought a old school performer (not eps) and plan on installing it soon. The truck runs fine at highway speeds, but in the low rpm's its sluggish and under load it misses and wants to fall on its face. I have worked in multiple shops and currently work in a motorcycle shop as a part time job but I can not figure this damn thing out. I know swapping the intake shouldn't really make a difference but thats how desperate I am.