Hei conversion troubleshooting

yeah I know I should do a plug chop but I really really don’t want to go out on the side of the highway in the heat and swap plugs.

I have the Edelbrock manual and have been reading it, but it isn’t really clear on the transition from the idle circuit to the mains, and what percentages each circuit provides at 1/8-1/4 throttle.

Is there an easy way to limit the amount of vacuum advance my can pulls? Stock distributor. A shim or something?