just installed a new ignition accel dizzy and mallory hyfire box. when i got her running it popped under load until i removed the vacuum advance line then it ran fine i readjusted the advance it seems it was wrong from the start the book says it is set at 12 degrees advance i think it was more like 20 problem now is how do i know what it is set at now. thanks sean

When you installed the distributor you should have set it to 12 degrees advance by turning the distributor if you adjusted the advance you probably aren't going to get full vacuum advance out of it anymore.

i did set it at 12 but still had the problem also it turned over like it had to much initial when i took the vacuum off it was fine sean

Did you have the vacuum advance hose on the ported or unported vaccum off the carb?

There is not enough vacuum on crank to pull the vacuum advance in normally. You should check everything again

hi yeah i know that but seriuosly that is what it was doing it was set up off the port on my 600 dp holley should have been perfect. mind you it goes like hell now it is a 350 sbc edelbrock angle plug rpm heads rpm manifold mr gasket headers flat top pistons turbo 400 2500 stall 3.1 lsd 9 inch all wrapped in camaro shell sounds yum hey sean