I purchased a 1988 39' Holiday Mansion Coastal Barracuda a couple of years ago and am unsure if I have the best pitched props for it. It has twin crusader 350 engines with inboards. Love the boat.

Most of the Holiday Mansions that I come across have I/O so I haven't been able to reference properly what the propeller size should be.

When I purchased it, the boat had major propeller damage and from what I could tell had 18x18 3 blade propellers on it. Does anyone know where I can reference what the proper size propeller for this?