Anybody go from performer to an rpm air gap

SAM67 said

^exactly what I was thinking. If I was leaving off idle or something I could see where initial would be important? I don't have issues with the car starting or idling. And I stall the car around 2500 so it's fully advanced when I leave the line so to speak?

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Leaving at 2500 on a 3800 verter is probably killing your chassis reaction. With a 4500 8" verter I leave best at 1800. Much higher than and the rear suspension is raised up too much, taking all the hit out of the launch (tires not being planted).
I'd install a set of these springs in the dist. http://www.summitracing.com/parts/mrg-925b. In my experience these will drop your total timing down to 1800ish rpm with a corresponding increase in initial timing. Lots easier than welding up slots in the advance plate.