Acme 422 most likely. There's also a 3 blade that people like, but the 422 is a gem. Use the PN discount for 25% off on that prop through Delta Props. Congrats on the boat. Those old euro backs track and ski well.
Previous: 1993 Prostar 205
Red 1998 Ski Nautique, PCM GT40, 310 hp, , Acme 4 blade, Perfect Pass SG/Zbox.
Be kind. Have fun.