Smallish cam & iron heads & pump gas @ 9.0:1, I'm thinking 10-12 initial, 36 max mechanical, and run vac advance. Used to routinely run that on stock 383s, woke them up from the factory setting. That was at sea level & in a warm (Calif) environment, pump premium. You might find yours wants the total limited as already mentioned, as I'm not sure every aftermarket distributor has the same curve. Gear ratio & cruise RPM can be factors as well.
