I don't wanna google this

Honcho, You won't be happy a 2 1/2. Like the others have said set it at what runs best. Give yourself 10 BTDC as a starting point,go from there.My Valiant is at 16 BTDC now and it likes it.(Timing chain stretch) Also if you find you run out of adjustment at the block tab bolt there is another bolt under the distributor that mounts the bracket that is slotted for more adjustment if needed.