500ci rb msd timing help/advice

Not sure how far along you are with your build or what your definition of a street car is, but that camshaft is really not a "street car" friendly cam. Especially with a 3500 stall converter. You might be happier with something about 10 degrees smaller and then you won't need the locked out distributor or a super high stall converter.
Motors in car. And I don't know for sure what size converter is.ill find out once it's running again. Got motor without prior history of it. Tore it down and replaced rings bearings and oil pump.

I thank you guys for your input. I guess I'll try it locked and go from their.

As for street car. It's a drivable project car that I drive when the weather's nice. No cage yet. After engine upgrade it's getting mini tubs and Springs relocated