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Early 5000s used a rather thin head gasket, and these had a propensity to leak and/or blow with regularity until Ford came out with a thicker gasket in the later models. Installing a turbo would obviously only compound this problem on the earlier tractors, as many non-turboed tractors have the same problems. If you do in fact have the thin gasket on your engine, don't change over to a thick one unless you wan't to use ether every time you have to start the thing. Best you can do is to surface the head perfectly flat (it will almost certainly need to be done if the gasket is blown), make sure the block is withing .003" or so of being flat (Ford "allows" .006", but this is pushing your luck with the thin gasket), and then be careful when reinstalling the head. By this I mean make sure your head bolts and block threads are clean, the bolts are oiled, and that you torque the bolts to 115 ft/lbs. I would then retorque the bolts after the engine has run a few hours. Make sure you retorque the bolts when the engine is cold. If you have done all this, then it is the best you can do, unless you want to change to taller pistons and go with the thicker head gasket. Another thought would be to shave the block .020" or so, but that would obviously be a lot of work!
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