1991 GMC 3500 Revival - Will it Run?!

1991 Chev / GMC 3500 Revival.
Big Red Dually.
It was parked, engine apart and open to elements.
Will it run?
Will it start?
Repair hole in floor.
Replace oil pan on 5.7L.
4 bolt main identifiers.
Credit: Tom Hanks
Castaway.