Is it spinning? 60’ is soft. 4:10 might help a bunch. Mine is a low gearset 904, but I run a 26” tire with 4:10’s, with a 9.5” ptc converter that slips 3-4% at the stripe. If flashes to 3500 rpm. Crosses at 6500-6700 rpm using the same crank. I have 1000’s of runs on it and dragweek and 60,000 street miles. It has been balanced to 1/2 a gram by a real old, very picky guy. Oh, with that hp in a sorted out combo you with be in roll bar territory. Low 11’s