91 gt swap out

i have a 91 gt with a 5.0 with bad motor. I found a '94 5.0 and i was wondering if it would be a perfect swap out or if it needs extra thing to make it work please olny respond if you know for sure. i dont want to get caught half way through and find i need more things to make it work

The 94 will be a mass air engine. Fuel pressure an air mix will be different. May look into if there are different size injectors. If so you will need the ecm to be swapped also.