to my haynes manual:

1. for point ign. 39 to42 degrees at idle
2. for transistor ign:
a. with pre-resistors : 33 to 51 degrees at 1500 rpm
b. without pr: 7 to 25 degrees at idle speed.

hope that helps.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.