I traded for a 1974 dart with a 1973 360 ,previous owner knew nothing about the engine other than it was rebuilt everything stock except performance cam,(size unknown) edelbrock LD4B intake, edebrock 1407 carb. ,727 trans.(stock converter),355 gears. Engine sounds good, sounds like fairly large cam (rough idle) . When driving (no low end power) runs fairly good mid and high RPM. Where should I start ?