Slant 6 in Buffalo NY Junkyard

grew up in Northern MN and live in MI, I know all about salt & corrosion...

this stuff can work small miracles: Blaster 11 oz. PB Penetrating Oil 16-PB-DS - The Home Depot

conversely, all you need to do is snap the studs holding the intake and exhaust manifold off and sawzall the headpipe and it's out in 5 minutes ;)