Alright I've ordered my new cam for a 65 Galaxie 390. I plan on putting 4 deg of adv timing into the cam timing. I've been told this will move the power band down a couple of hundred rpm's. I've installed cams before but always at 0 deg.

My question is what will this do to the ignition timing? If I'm currently running 8 deg adv will it move it to 12 or 4 or no change at all?