Please help with engine swap

I'm gonna make this short and sweet. I own two fullsize Blazers,an'89 and a'85,what do I have to do to put the T.B.I. engine,tranny and t-case,as well as the '89's power doors and 'gate into/onto the '85? I'm assuming I will need the '89's fuse panel,gas tank and some of the wiring harness,but,I'm not to sure about anything else like gauge cluster and so on.

             thanks for any help.