My 2 cents. My truck got parked in '73 in an Arizona field and barn, until it was moved to a barn in Wyoming in 2008. When I tore mine down this year, I found the T-stat housing had rusted out and all the coolant passages where full of rust and grime. I've flushed the head a few times, and the block a few times to get as much as possible out. The machine shop will be doing an acid dip to kill it all internally. I will say though that when I pulled my head off for the 1st time, all my pistons, cylinder walls, and valves looked better than pictured above. The pistons have some carbon build up, the intake valves had a little too, and the exhaust where all stained white from leaded fuel. If I was in a pinch for a replacement engine to rebuild, I would probably pull the trigger on this one. Even with the drive, call it a weekend getaway.