Thanks, Fath in law bought an abatement IDI... (qt of oil every 15 miles or so), it has a 7.3 (its an 87 though, thats a head scratcher), and we have two 6.9 motors, one (the better one) is complete minus driver bank head the other, wouldn't fire off ether..... aLOT of ether..
Unsure if its heads are any good.
If his 7.3 heads are good... then logically, we would be desirous to put the 7.3 heads ont he good 6.9 block.