37' full displacement, 165hp Perkins turbo, 1.92:1, 8knots at 1600rpm, 11knots at 2400rpm (ugly and noisy with major squat) ..... 24X20 prop.
Your prop is seriously wrong if your numbers are correct. Suggest you double check prop size and run one of the on-line prop calculators.
Aphorisms to live by .....
If you can live with the consequences, go for it - wg
Y'am what I y'am an' thats' all that y'am - Popeye