81 40hp merc wot??

[livetohunt123]

I'm new here to this site, so here it goes. I just got myself a 69 Starcraft Falcon (will post my restoration thread this fall when i'm done fishing). The Merc on the back according to the ser# is an 81. The prop has a chunk out of 1 blade the size of a half dime. Prop part #48 85632a-4 11p. I think it's 10 3/8". I have a tach on order to find out what rpm i'm running at wot, but need to find out what the factory recommended wot rpm range is for this motor. This way I can find out if the pitch needs to be different on the new prop I order. Any help would be greatly appreciated. Thank you.