My 350 track results...
Well to start off it was a very hot day, like 32C, not good day for racing. My first pass I had no tration and had to let out.
My best pass previous to date with the 310 was:
Traction and wheel hop was an issue all day. I strapped the front end. and aired down the tires 25psi.This truck is a CC/SB with 35's and 4 inch lift, traction bars also, at 8200lbs. I made 3 -13.08x passes but ran out of runs to get any better as well I only ran the 350 tune. Trans shifted spot on with Spartan tcm and Suncoast converter. When I made the 12.9 pass with the 310, the day was much cooler. I agree with Jeff that the 350 might need a bit of tweeking as I do feel there is more power with the 350 than the 310 on the street, but the track isn't showing it.