vacuum advance disabled

[Terry,OH]

Since this is a brake, without the vacuum the advance is not happening correctly. It is in full brake all the time unless internal parts have been removed such as the spring, or even the piston. It would be very easy to drill and tap one of the intake manifold intake runners for the vacuum you need. I suspect the big problem may be fuel related. Too big of main jets resulting in rich mixture. "cut out under load" also check fuel pressure, too high or too low, want 2-2 1/4# at Carb.