Wonder how bad the drivetrains are? As a boat tech I know you don't have much time on boat motors to get them douched out once they have been swimming! Saltwater is EVIL! I'd bet the motors would save if you tore them down right away and cleaned the crap out of them.
I hope it's OK that I showed these here,they are not mine. I just thought some of you might like to see them. Wish I had the funds to buy them and part them out as my friend has a wrecker in Florida working right now removing cars and boats from the hurricane.
Bad thing is the guy I bought the block from had it bored 40 over. So I guess I'm going to 60. Main reason I bought the block was the fact that it was align bored,decked and cylinders bored and CLEAN.
Scoggins Dickey Chevrolet sells a brand new GM performance block #10105123 for $1315 w/free shipping.That eliminates machine work costs. Put a good new forged crank,forged pistons and rods. Get it balanced and buy some good quaility aluminum heads. Or they have a ZZ4 GM performance short block...