My "bad" on saying run as is. I would hate to see you wash down your cylinder walls the first run out. BBChevy is probably real close with 170.
On gas, you would be 88's to 92's, so buy some 174's to start. If your RPM is going to be close to 8000, back them up with some 178's. If the RPM will be 7500, back them up with 170's.
Good luck with your testing and keep us posted.
Dave