has anyone bought headers for a 454 or 427 to go in a 72 blazer 4x4? if so was the collector at the front or back for the motor? were the manifolds the same? thanks for you help. If you build it, the mud will fly! 72 K5 blazer soon to be 1 ton with a 427 tall deck and TH400/NP205 and 12"of lift with 40"tires.