I have a 83 blazer. Has a completly different drivetrain out of something else. Has a 4-bolt main and factory GM aluminum intake. It currently has stock manifolds. I bought a TH350 tranny from Koldsimer and also bought the headers from him for super cheap(7 bucks ). Someone told me i should stay manifolds cause of powerloss and stuff where he made no sense. But the exhaust needs to be replaced as its all factory and custom booger welds in places where its falling apart. It also needs to be reworked around some stuff. Which would you do? Eigther way exhaust needs work and will be rerun anyways. Pics of headers(1 3/4" tube into a 2 1/2"+ collector)btw- my camera sucks!