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IFF at some point this becomes a collector car, I would assume that you would have hurt the value by doing anything other than preserving it's original equipment.
If your goal is to eventually try to sell the car and make as much money as possible, then you should probably leave it as-is especially in the case mentioned above.
If you don't care about resale but want to be true to the car and bring out it's potential, an SR would be the only acceptable swap as long as it was done very clean and as factory as possible. These are all opinions of course.
If it were me and there was a market I would just sell it and buy a car I wouldn't feel bad about swapping or modifying.
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