Is your transmission surviving all this power?
I was lucky enough to have a very good friend who makes his living building racing automatics and he modified my original '72 904 Torqueflite with some extra clutches and a Turbo Action shift kit, so the transmission has never needed attention.
I cannot give you any advice on the spark curve issue, since the distributor in my 360 Magnum with the Vortech had never had a timng light on it (true story) when I ran it on the dyno for those numbers.
I was totally ignorant of what kind of damage I could do with too much timing, and simply set the initial where it idles well..... call it beginner's luck, or whatever, but I must have been close. Only good luck I have ever had...
My slant six car with 10-pounds of boost from its turbo, is locked in (no advance of any kind; no mechanical mechanism in the distributor, and no vacuum diaphragm on the distributor,) with 18 degrees, total.
It seems to like that number; starts well with no kickback on the starter, idles like a stocker, has good drive-ability and monstrous mid-range torque, with good torque right up to its 5,500 rpm redline. Gas mileage is unbelieveably bad, however, and that is no exaggeration, but I don't drive it much on the street, so it really doesn't matter.
I wouldn't recomment this system for anybody else...
Good luck!:cheers:
