Well, first of all, putting it into an '84 is going to be significantly harder that any other year. There are brackets on the engine compartment that the later years have that the '84 does not, also, the main vehicle wiring harness is different (C500 most noticeably is on the driver's side on '84s and the pass on all later years).
This is not to say that it can't be done, but it will involve customizing the wiring harness and fabricating several brackets.
Yes, you will need the ECM from the 2.8, also the tachometer (really all the gauges, to keep the same font) if you want/need the tach to read correctly. Also, don't forget the fuel pump and lines/filter assembly, and the air filter.
It's possible to modify the coolant lines to work, but it's been something like ten years since I've done that particular job, and I can't really remember what I did. I know I didn't have to so any major fabrication, so it should be fairly obvious what needs to be done, should you decide to do it.
Fully dressed, I would guess the 2.8/5-Spd combo to weigh 500-600 lbs. If you split the trans off and took all the accessories off, two big guys could pick the engine up, but it would be a strain. No offense, but I don't think you qualify as a "big guy" from meeting you at the F.I.E.R.O. meet last weekend.
Oh, and the '84 coupe rear facia only has one cut out for the tailpipes, so you'll need to either cut it out, or replace the bumper.
EDIT:
Oh, and shifter/throttle cables will be different.
[This message has been edited by FieroJimmy (edited 02-27-2008).]
