Carburetor choice
What, in your opinion would be the best vacuum advance distributor available?
Sorry man, I have never bought an aftermarket D so I cannot say.Nor have I ever tuned a blower-equipped engine.
Honestly, the possibilities are mind-boggling, and I have zero experience for this combo.
But I can see that the VA equipped D could be a benefit to your street combo, if you are now limiting your maximum Power-Timing, to some sub-optimum number, as compared to a Normally-Aspirated engine..
Like; if your boost does not begin until 3000, but your stall is 2200, then yeah, the VA could bring up the low-rpm torque, and especially it could help with fuel-economy.
But if your stall is 3000 or more, I can't see it being of much/if any, help, except again with fuel economy.
But if your boost begins both at low-rpm, AND at light throttle, then I'd say forget the VA............
And if you have iron heads, I suppose you'd have to be real careful to avoid detonation at Part Throttle.