Im doing a 78 Malibu with a big block with a five speed tremec. The question I have is can your run long tube headers with a manual clutch or do you have to run a hydraulic clutch? Im in the process of doing my homework and cant find the answer to this question. I have see one car on a forum that is running a big block with a factory manual car. So it should be a manual clutch car but I see he is running manifolds. I think this is because of clearance problems with header? I hope someone can tell me for sure.