New here also

[McGillicuddy]

You'll be fine. 90 ponies is fine, even in gray. You'll want a stern lifting prop, something described as "easy to turn," meaning little cup, mild rake progression and fairly large blade area with a fairly straight front edge and nicely curved rear. that sounds kinda, well... anyway a semi-cleaver, probably 13-3/4 x 14 or 15 pitch. Make sure you are able to dial it up to max recommended rpm full of gas and peeps and ginger ale. I always suggest the quicksilver black diamond as the starting point. cheap, kick ass prop perfect for a 33 mph 20' seacraft with 90-115 hp. Yamaha's own semi cleaver is also a decent starting choice. a 4 blade with maybe a little less diameter will also fit the call. You'll want the anti-cav plate about 1-1/2" above the keel with the plate parallel to keel.