Assuming it's single-stage:

Each cylinder has a volume of 3.14x 1(squared) x 2 inches = 6.28 cubic inches

There are two cylinders so it is delivering twice that volume = 12.56 cubic inches per stroke

At 750RPM that's 750 strokes/minute or 9420 cubic inches per minute, which converts to about 5.45 CFM

Hope I've done that correctly, it's been a while since thermodynamics. Couldn't figure out power needed, got 645W which seems awfully low.

EDIT: Just read that an average single-stage compressor delivers 3CFM per HP at 100psi, so to deliver 5 CFM at 150 PSI would take at least two and a half or three horsepower