Vetting a Formula S

to me, the rarity of the vehicle plays an important part of the whole numbers game.

like if i was gonna buy an M code car it would have to have the #'s matching motor and trans. the same for something like a survivor car or a "1 of [***]" piece. that, to me, is what makes it special and unique.

on an S car, non OG numbers but correct pieces would be acceptable with that type of 10~15% adjustment. again, in my personal thinking. it wouldn't be a deal breaker, but the number could move the needle either way if i was on the fence.
A good friend has a Hemi Coronet R/T. It was a drag car since new, and never got cut up. The original engine and trans are gone. It's still a desirable car even without them. But it would certainly be worth more with the original pieces.
Another friend restored an M code Dart without the original 440. Also a retired drag car. After it was done, he found the original engine. He sold it with both engines and they eventually made their way to a FABO member. It had been previously owned by a different FABO member.
Neither of these (have) had original engines, so worth less monetarily than those with them. But both are awesome and I'd love either one.