Tom, what do you have besides the engine? Base? Pump? Unloader? Anything?
A Pressure Pro belt drive base will accommodate the pulleys to make 1750 rpms at the pump using a 3 groove B section 4.25" pulley on the engine and an 8.75" on the pump.
Trying to make 1450 is tough. For the horsepower, anything smaller on the engine than 4.25 is going to cause problems, and the pump pulley required to slow the pump down is just too big to fit in the belt guard.
If you want 1450, I'd recommend a gear drive.