[Doc Watson]

Thanks Guys

My engine is running 10.5:1 compression (sorry omitted that info).... so it looks like about 30 degrees max advance should be used, which means that I would need 4 degrees initial advance using the 13 degree centrifuge slot.

Its a standard 2 bolt 289 block, original iron heads and a 'mild' cam. Im looking for 300 HP which will be enough for me.....

What effect will the initial advance have on tickover, I want the engine to rev at about 800 at idle or is this more a function of the cam profile?

Regards Andy