If you're running delete pullies on the AC and PS try AC Delco - 6K615. its 13/16" x 62 1/8". This is what I am running for the passenger side stuff (Alt, AC delete, PS delete and tensioner) Of course not all delete pulleis are created equal, but this will get you in the ballpark. BTW I treid using the stock LT1 belt but it was way too long.