well sorry to hear about the leg, hope you're recovering soon.
The K member will need to be replaced with a 5.0 mustang K member
this was not required on my 93; just changed the motor mounts and used the same kmember that came in my 2.3
I recommend doing a full EFI set up, your wallet will thank you when you can get close to 17mpg instead of like 8 mpg.
My advice on 2.3 swaps:
1. I'm a girl and did a swap, so you can too
2. EFI is way easier than people think until they try it
3. your best to get a donor 5.0, even if you dont get the engine with the donor car it can help with allot of little things like the computer, rearend, tranny, engine harness, gauge cluster, drive shaft, throttle cable, fuel lines if they're worth the salvage, and even REFERENCE on what should go where.
4. electrical related parts must come from these bracket of years 87-89 or 90-93, air bag vs no air bag- the wiring colors changed when they added air bags. Do yourself a favor and get the exact year of your car if you get a donor car if you can, it's worth the extra effort later on.
5. you CAN run the existing rearend, it comes with 3.73 gears, fun stuff until you break it; but if you are easy on it it will work for years (been running mine now for 8 years cause i'm lazy and didn't put my 8.8 in yet)
6. Engine: just get any 87-93, but the earlier years ran slightly better internals, i forget the kind of piston i think isn't quite that good in 93; not 100% what years that went, but I love my 87 donor engine
7. computer: if you have an auto i think you need an auto computer, i think if you're manual either works; but check; one will not work with the other; but the other does both....spend a few mintues searching because i'm not sure i'm remembering 100% of which way it was.
8. check out my website; i documented my entire 2.3 swap. you can get an idea how much work it is and if you're up for it:
My 5.0 Swap
9. swapping a 2.3 to a 5.0 is not efficient for cash reasons, however; it's allot more fun and even better when you can say you put the car together yourself