Demon NO Go

You need to shorten the advance curve in the distributor.The y have about a 28 degree curve in them from the factory,that coupled with your 12-14 initial puts you over 40 total and well into detonation territory. Were the block and heads decked alot ? Does it have adjustable rockers or pushrods ? Did anyone verify lifter preload and make sure it is not too much and holding a valve open ? Depending on how big the new cam is 8.5 for compression may not be enough,it may require more initial timing.