If you're concern is long-term resale value I don't see anything wrong with mods that can be removed and replaced with the stock parts you saved when the time comes to sell.
I think it's a pretty safe bet that a collectible classic car will almost always be worth more the closer it is to its original configuration.
...oh yeah, a big  from Derby!
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Previous Cars: '78 Z28, '92 Z28, '95 Z28, '85 Corvette, '01 SS, '96 Z28, '04 Z06 Corvette, '10 SS, '13 SS Hot Wheels
Current Cars: '17 ZL1(daily driver), '04 Trailblazer (rain & snow), '66 Corvette (restoring)
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