Hey new to the forum. But some great info hear.. Its been a few years since i tuned a tbi system. And was just wondering if someone can clarify If the $0D XDF from moates site has the Spark bias added to the main spark tables or subtracted?? Meaning that when looking at the table, is it actuall crank timing or is there 9.84deg added to it with the bias etc??
Just tuning a freinds stock rebuilt 350 and looking to get a little more HP and mileage out of it etc.. Or if someone has a good spark tables to use as a starting point etc.. The vortec timing table looks like it might be ok?

This is in a GMC 1500 4x4 etc.. Thanks again and appreciate the help.