Well, I got my "new" engine in, got everything bolted up, but before I start her, should I do anything important other than putting in all the fluids to their appropriate level?

The engine has sat still for about 2 or 3 months since it came out of my doner car, and I really can't afford to screw this engine up.

 

pull the injector fuse out and crank the car over for a while...prime the oil system. make sure that you're getting oil pressure

 

In addition, put a few ounces of oil into each leading spark plug hole. It will help lube things up for the first little while and bring compression up for the initial start.