We use to run a 14/71 on a 355 ci small block chev at 27% over driven.
It was full on drag car, but hell, it made that small block sing. We use to cross the finish line at 8,500 rpm, with that set up, the blower was spinning at just under 11,000 rpm.
Good luck on your trip.
If you need cusso parts, PM me, a mate of mine is Customline Motors (Cusso) at Traveston.