Just guessing, but I think I'd lock out the advance and start at about 36°, based on the comp ratio and combustion chamber size . . If he's got the right MSD smart box, he might leave at around 38° and bump it down to 34° or so at the end of the pull.
I'd think, because of the demand on the engine and the increasing weight of the sled as he gets into the run, you'd want to increase torque at the end of the run. It's kind of inverted way of racing. We gain momentum as we increase the run time, he's trying to get all the momentum at the start and needs brute torque to end the run. I think. ejm, correct me if I'm wrong . .
But it's still just a SWAG because I don't know the type of fuel (maybe I missed it here) or the kind of air he's running in . . . either . .
On th' HP thing . . Not being a wiseass here, We're getting mid 9.20's @ 150 with an iron '67 Camaro (582 BBC & 2800#) at 4850' msl (8700' corrected) and we don't know, or care . . Because it really doesn't matter, well, at least unless you're ordering a new converter . . (Tongue in cheek there)
The race track is the most honest dyno ever created! . .