Here's info on the exp swap:
Biggest thing is going to be the harness, hard to say what way you should go though. Other stuff can be pieced together...
My 5.0L was an 87 engine, has 96exp heads, different reverse flow timing cover, different water pump (single serpentine), 4bbl intake, etc etc etc. I think the only thing that isn't different is the block, crank and rods - and even the rods have ARP rod bolts installed.