Re: [Classic Mustang] engine restore question

       Seeing as you are a new owner and money is not too big of an issue I would perform a complete rebuild unless you know for certain one was performed within the last few years or so. There's a couple of reasons why I lean in that direction.
       First, the car is 43 years old. You don't know for sure what has or has not been done. By doing a rebuild you will know exactly what work was performed. In addition, you get to call the shots. A machinist may tell you something has some wear but is okay. If you don't have a good feeling about it you are the one who makes the decision whether that part should be replaced or reused. Right now you are driving someone else's engine. Performing a rebuild makes it your engine.
       Second, items like engine nuts and bolts are also 43 years old. Things you could have gotten away with reusing in 1975 may be more of a risk today. Head bolts, rod bolts, main cap bolts, should be replaced. For example you don't know how many times, if any, the head was removed from the car and reinstalled since 1966. Unless you plan to put the engine under hard conditions or add serious extra horsepower replacing those items with stock units should be fine. It would make sense to replace items like the timing chain, oil pump, and have the head checked for worn rockers, valves, springs, etc plus a standard valve job and valve stem seal replacement. (I am partial to teflon seals) Rebuilding the carburetor would also be in order at that time. If the starter is greasy and full of oil it wouldn't be a bad idea to replace or rebuild that as well. Nothing is more frustrating than to spend big bucks on an overhaul and have the starter soon die because it can't turn a tight engine.
       Third, you can take advantage of materials and technology which was not available years ago. Instead of rebuilding a stock distributor you can install a complete MSD system which will not only add some ponies but increase fuel mileage. That's a combination which is hard to beat. You probably won't need teflon coated pistons but after so many years everything should be checked and measured.
       The Ford six cylinder engine of mid 60s vintage is a great, dependable, hard working engine. Thousands of them have been driven into junkyards because they outlasted the bodies. The chances are better than 50 / 50 you'll be able to safely reuse a number of parts. If you find you're coming in under budget you then have the option of replacing things such as the wiring harness in the engine compartment (especially if the car was subject to road salt) voltage regulator, starter solenoid, maybe even spring for some chrome goodies. Your options are as open as your bank account.
       As a new owner who is not necessarily on tightly limited budget I would have the entire engine rebuilt top to bottom, whatever does not need to be replaced should at least be checked and measured, and take advantage of modern technology and materials. You will then have an engine which will give you many years of dependable service, respectable fuel economy, driving (and showing) pleasure, and it will add value to your car.


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