I finally replaced the vacuum advance and centrifugal weights in my HEI distributor on my bone stock mid 70's 454 truck! It's got good timing & compression, new plugs, wires, cap, rotor and Quadrajet kit but still don't have the response I believe it's supposed to have! The Quadrajet has issues with the secondaries, not sure why, but that won't affect the off idle response so any idea's on what to check next?
