I was reading a very good article which made sense to me which I will use when tuning my SBC with Qjet (I think follows what Denny recommends, I'll let him comment on that):
http://www.73-87.com/7387garage/drivetrain/hei.htm

With the above setup, it will yield 30 degrees of advance at idle, that sounds very high. I have not tried it yet, just seems very high.

I have bought the Crane kit and installed it, but have not run the engine yet.(I just discovered my NEW China-Ebay HEI's vacuum advance canister diaphram was broken).