Good friend of mine had a '94 272 with a 502. Do not know what prop he ran, but he said 63 was all she had.

My 98 272 w/502 all stock except for em thunder exhaust ran 65 gps with stock 23 mirage and 67 gps with stock 3 blade 24 turbo. I sold the 24 turbo to a guy that has a 26 outlaw with 496ho that has as he puts it(a prop collection). He says the turbo prop is the fastest one he has.