Well, the "leveling", actually is the alignment between the driveshaft and the pto and the pump, so you will need an alignment tool.
Make sure you have a good metric socket set of tools, especially 10's and 13's. A hex and star bit long sockets that fit into your socket wrench are the bee's knees, you can get them at harbor real cheap, great for attaching carbs and starters and alot of other pieces on a seadoo.
Make sure you clean out the oil tank real good before you put the motor in, it helps to have it drained as well.
One thing i like to do is hook up the rotary valve bath hoses to the motor before i put it in the ski, it is a good time to test for leaks, i have had the one under the exhaust leak before and it was a PITA to fix as i had already reassembled and had to take it all apart to fix the leak, think [MENTION=57920]racerxxx[/MENTION] has a story about that as well...
Hmm what else what else, just go slow, take your time. I like to put the carbs on the engine before I install it, make sure all the gaskets are in place and what not, that is just personal preference tho.
Dont forget the rubber bumpers in the driveshaft. Lol its been a while since ive done a swap
I remember this was the motor out of the spx, what was the final verdict on the compression of this motor?