The unit I'm intending to use is a single V pulley (Suudebaker) and because the plan is for pulling a trailer and not racing the RPM's will probably never see more than 4000-4500 and that would probably be rare.
'45 Ford PU 66 Valiant wagon, leaning tower of power. 79 Chevy C10 w/250 02 PT Cruiser Convertable