Re: ???
I think it comes down to simple supply and demand. "Supercars" are in very low supply and in great demand, so when a "Supercar" is found less engine, trans, rear, etc. it makes sense to substitute these parts with the next best thing, i.e. date specific castings, CE blocks, re-stamped parts, etc. When the car is "complete" again it's value should at least warrant the efforts put forth (tracking down $$$ parts etc.) to make it that way. Since there is so much demand for the ultra rare Supercars, even a reconstituted example will still attract many eager buyers and be looked at as a good collectible car. While the same scenario can and does apply to lesser cars like Z/28's, Super Sports, etc. they are simply not rare enough for everyone to overlook their shortcomings (incorrect parts, non-factory intstalled parts, re-stamped parts, etc.) for them to be seen as valuable purchases. The car carrying non-factory installed parts (re-stamped parts, over the counter parts, etc.) is always the lesser car, sometimes it's just not as detrimental to the car's overall value if it is so rare that few "correct" examples exist, i.e. lack of substitutes. Take the '69 ZL-1 Camaros for example, very few of these cars have their original drivetrains, but they are still very valuable and coveted cars nonetheless. Simply because they are so rare that a NOM ZL-1 is enough for most, while undoubtedly the unmolested #'s car will be worth significantly more. Also keep in mind that some lesser cars like Z/28's and SS models may already be looked at by some buyers as a cost effective substitute for a "supercar." For this reason many of them are only willing to buck up for a pefect unmolested example. That's not to say that there aren't plenty of people waiting to throw $ down for a NOM Z/28 or SS, but it's just not to the same degree as those people who have been waiting for a chance to find that ultra rare Supercar. Look at it like you'd look at anything else of rarity, if you were looking for dinosaur you'd pretty much take anything you found and you'd be happy. If you were only looking for an alligator you might wait around for just the right one with all it's original teeth etc. In the supercar world, you take what you can get when you can get it, JMO.
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