well we already have a new intake manifold and we just took off the heads and it was completely trashed with sludge(as if it never had an oil change in its life) the spark plugs were almost completely eroded, there was mold where the antifreeze should have been, and to top it off there was standing water in the piston heads. needless to say it is getting a complete overhaul and we are going to have it bored out and rebuilt. great suggestions thank you and more would be great too. also its a 93