Belt slip will occur the most in the upper RPM range. It won't be hard to tell if it's slipping, the engine bay will be covered in black belt dust. I would run 100 octane with a can of Torco for good measure, ~105 octane at a minimum. No less than 110 when it gets warmer out. Anything past 23PSI is just making heat and there's very little in terms of HP increase. Torque will continue to go up but it's generally offset by the timing being pulled up top due to the IAT2's going past 150. I'm curious to see what it makes, shoot me a PM when you get a good pull on the Dyno. Thanks.