The GT350. Much rarer, much more desirable, arguably much prettier car. At an auction, most will ignore the Mach 1, and beeline straight for the GT350 with good cause.
The 1968, as the 1973 was an over-bloated body and the emissions control by that year had reduced performance tremendously. Many muscle car/high performance buffs say that there was not a decent muscle car built after 1972, and I agree.
You should also consider that such a car may be expensive to insure. Check your insurance rates before buying one, for example here - carinsurance.deep-ice.com
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