leaking holley 3310. hard restart

It's not timing related.

I'd take the carb off and look at the primary transition slot and set it as a square. Whatever you turned the idle speed screw out to get there, turn the secondary open about the same amount. That should balance it so your idle speed will be close to same as when removed. Minor adjustments from there.

The wrong metering block gaskets and warped surfaces will cause issues as well. Allowing fuel to travel across the surface to areas it's not supposed to find.