i have a nearly stock 440 in my street 4x4.its got 9:1 pistons,shim head gasket,rv cam,holley sreet dominator mani with a eddy 750 carb. timing is close to stock. also cyclone 1 3/4 full lenght headers. i'm going back to a 69 intake and exhaust manifolds. was wondering how that is gonna effect my power.thanks guys,ken