I don't know if this will help or not but I have a 428 that the previous owner by-passed the PVS and I haven't fixed it yet. The q-jet, on the front drivers side of the fuel inlet has a hose outlet that works my vac advance. at idle hooked or unhooked the idle and timing is where it should be and hooked it advances with accelleration.I found a three way vac fitting,large one for power booster,1 sm one for heater control valve and 1 small one for the PVS switch.Hope this is correct for my GP,I have a 2 way for my Firebird.
