By all means build different bushings and do some testing. Eventually you'll come to the conclusion that the MSD pro billet distributor is a bad choice for a street car. If you want to accelerate your learning curve get an O2 sensor and hook up a EGT. Once you hook those two things up you'll start to see why you need vacuum advance in a street car.

The hot ticket these days is a fully computer controlled timing curve. My advice for anyone with a big stroker motor is to sell their carb and distributor and buy a Holley Sniper setup with the HyperSpark distributor. Then you get full computer control of the fuel curve and the timing curve.