Skelton

I've been running a hpp3 with a gmaf and its a perfect combo in my internal stock bird. A/F is 12.8-12.9 @wot with no kr or spark knock. I just bought a Predator hoping it will cure my god awfull tm problem. But, I'm worried that the a/f and timing may be a problem since I plan on racing this weekend at Beech Bend and don't have time for a dyno run. Anyone try this combo with success or should I just go factory tune and add a couple of degrees of timing and start there? Any suggestions?? Anyone know what the target a/f ratio and timing is on the base tune? Thanks