My BIL has a 11-12 z7 with a 24 tempest, 150 pro xs and it will smoke me. He has got 61 with two ppl before. On average min will get 60-63 depending on water temp w/ just me. His mid range to top end power is a considerable difference than my 175.
I would lay a 8ft straight edge against the bottom of your hull. You will more than likely notice a gap right above your trailer axle.