Shoot dude...Painless would be getting a 94-95 LS motor. When I did my swap I waited till I found a 95 motor. IT was out of a LS automatic for the fact that I dont want and chance of a bad motor compression wise. Got myself an LS manual tranny with a ACT heavy duty clutch and all the bells and whistles.
Let me see if your parts are right:
Trans: What car did it come from and was the LS engine a manual or auto, did the tranny come with it?
Axels: Replace them with brand new GSR axels. I could have used the ones that came with the engine but why do that? IF you want to put power to the wheels at sometime you will be glad you invested in the GSR axels.
ECU: ITs a p72 right? I really forgot which one you need on the engine. But mine was with the auto engine due to the auto tranny sensor. IF you did have an auto tranny engine just loop the sensors and the check engine light is gone.
Harness: Duh...that one is good to go.
Mounts: Ok this one is wierd. In my case I needs a GSR rear and right side mount to fit the engine in the comparment properly. It took about 2 hours of jimmying to find that one out so just letting you know my pain if that helps any.
Shift linkage: Needs to br from a GSR to fit properly. Although if you have a welding setup...you can make your own. But if you want it to fit perfectly, the GSR linkage is great. Drop a good short shifter on there while you are at it. My god it makes such a large difference. With the B-series tranny compared to the D series...it will feel different for a while but the short shifter really is awesome.
FYI: What I thought would take a day or so to do the swap...ended up taking 3 weeks. There are a lot of things that break on the engine during shipment. I basically had to replace all the sensors on my engine along with the alternator and add a starter. Then after starting up the engine we found the oil pan leaked....and then some of the other parts needed worked on. Always assume the worst man. But its worth it...Good luck.