Re: HOT, damn hot. 42*C
Ford spent millions of dollars researching all this stuff, don't try to re-invent the wheel, look for the problem and solve it, is your system clean inside? i mean really clean? is your radiator ok? is your block so thin in the bores that nothing's going to keep it cool, is your thermostat the correct one?
Iron water pumps work fine, theres nothing to wear out in there anyway except the seals and a bit of rust!
Look at fuel mixtures, lean motors run hot, look at timing, look at distance from fan to radiator, its important, look at shroud clearance, etc etc, 9 times out of 10 going back to Fords original settings or specs solves the problem!.