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Just a couple of quick thoughts:
A mid-1960's 70k motor would generally be considered near the end of it's service life, especially after 50+ years. Back in the day, you'd be very lucky to get a motor all the way to 100k. Before doing anything too radical, check the compression all around and/or pull the heads to see how things look--if most of those miles were piled on in the 60's and 70's, there could be a ton of carbon build up in there.
There are a bunch of reasonably priced EFI kits out there that can give a modest performance boost without a bunch of new parts. If the engine is sound, this may be the easiest way to get what you want. Added plus--easier starts and no chance for vapor lock.
To my way of thinking, the only reason for a performance cam is to encourage better breathing. A cam can't do much, though, if it's inhibited by the stock manifolds and ignition system. Also, better breathing = hotter burn = hotter running motor. You may need extra cooling if you live in a warm climate.
I don't show my car, but I'm aware that some car shows have a "modified" category. Based on my experience with the hobby, most t-bird enthusiasts wouldn't consider a car "collectible" with these kinds of additions.
Good luck with the project, and let us know how it goes!
~Steve
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