You should be able to use the other components. Later alternators can be a little larger which can be a minor problem where some clearing is needed. You can change the pulleys if required - I guess it is up to the brackets. I know it all late accessories fits if you throw it all in engine and all as one unit.
1) Timing cover should not need to be changed.
2) Will need to change the water pump as the serpentine was a reverse direction pump.
3) Clevo brackets I would expect not to work (though I have not personally tried it).
4) Early Mustangs use the front sump. If you find you need one I have one in my garage of parts (with a pickup). It is in good condition.
Dpends on the type of pump and fuel delivery. If your going EFI rather than bolting a carbi and manifold on her (which I can also help with), at a minimum you will need a High pressure pump and a return line. If going carbi the return line is optional - depends on the low pressure pump design. Most do not need a return line. Some need a remote pressure regulator mounted near the carbi (aka in the engine bay).
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