Yeah, it's been a while! I know about that just about dying stuff, I went through that last fall, bad ticker though.
OK, anyway..........
The prop should be an easy one to spin as props like that or a 2716/2 are great starter props.
Pipe at around 12-3/4" long. Strut way up. Carb, 2 out on the high-speed needle and 1 out on the low. Just about any engine will appear to run fine on shore but can go south once there's a load on the prop.
I've seen some weird stuff though. One guy that I run with had a prop on his Sprint Cat that would usually run great on the boat but one day it didn't We tried a prop swap. It didn't run any better so we put the other one one, tossed it in the water and ran great! Still scratching my head over that one! We didn't change anything else, not even more fuel.