Tom, 2 things you need to consider on your piston replacement. #1 make sure you can use a grade #2 piston from Ford as it's the only replacement size available. Your piston should be marked and if not, you should have 6 numbers and 2 arrows on the valley of the engine right behing the power steering pump bracket that tells you the piston bore sizes. #2 You have to buy a complete piston, rod, and ring assembly as it's the only way they are available from ford and they run about $250 each! So for an additional couple hundred you could easily get the new pistons, but then you should have the engine balanced again unless they're within a few grams of the originals.
Rick
