EFI converson

I have a 87 notchback with a carbuerated 5.0 that I would like to convert to EFI. It was originally a 4cyl car that i converted. When i did the swap it was my only car and i had to have it running within a weekend so i went carbed as i knew i wouldnt have any problems getting that setup to work in a day.The motor i put in is was from a wrecked doner car and i have the C3W1 computer, Speed Density harness with the FMS MAF add on plug, intake and most of the other associated parts for the swap. The harness that came with the motor was butchered with cut wires, melted wires and wire nuts. I have an old harness from a speed density GT that i cleaned up for use in this swap. I also have a garage full of misc mustang EFI associated parts so i have all of the parts to do it as it came from the factory. Emissions are not an issue to me at all, my car always passes. I already have the fuel line and pump issues covered. My questions are

1. Is the EGR system necessary for anything other than emissions and cold startup? I blocked off the openings on my heads and would have to pull them to open up those passages.

2. That computer is a auto computer and i have a TKO, will i notice much performance difference there? Is it worth it for me to get an A9L?

3. Will the MAF be able to pick up and adjust for my E303?

4. Are the MAF sensors different from year to year? (it is the only part i need to buy)

5. Are there any other Do's and Dont's that i should watch out for? (IE "make sure all of the vacumn lines are hooked up corretly under the upper)

I have a bunch of stock 87-93 intakes (with all of the stock stuff on them) i was going to use one of them. I had also thought about taking my Vic Jr. to my buddies machine shop and drilling out injector bungs on the runners and fabbing an elbow and using that, but i think that would be more work than its worth.

Will a MAF from a 96-03 work?

Anyone know where i can find a diagram of the EGR system and some info on how it works?