I have modified my 350 (World S/R torque heads, Voodoo cam and lifters 213/219, Crane roller rocker arms, new timing chain, push rods and a Wieland air strike intake[/I]) and for about a month and a half it ran great, now it has a bad bog when the accelerator is hit fast, I have checked all the normal stuff on the carb (cleaned it, put a 4.5 power valve in it, went from a 25 to a 35 shooter, put new accelerator pump in 30cc, I even tried a new carb) and ignition (I put a complete new HEI distributor coil cap rotor and all) I also have tried the timing from 5 BTDC all the way up to 15 BTDC and put weights and three different springs in. I have done a compression test and it came out to 150 psi per cylinder, the vacuum is 19 with a slight rapid vibration, now I’m stumped on what it could be, any ideas would be great

Little more on the engine it has stock pistons, Holley 750 vacuum secondary and is in a 72 chevelle with a 700R4 trans and 3.37 rear end