I respect differing opinions, but since one was fired out there I thought I would also state mine: There is nothing wrong with customizing any car, in any way, to one's personal taste.

And if I were theoretically shopping for an F-bird, and found 2 otherwise identical Birds to choose from, with the exception of OHC Pont 6 vs. the other with a properly transplanted Chevy V8...I'd actually buy the car with the Chevy 8. And I'd probably even be willing to pay a small premium for it over the 6 car.

And many others would think I was nuts.

But "value" is in the eye of the buyer. Different strokes for different folks. Overall I've never cared much for "all-original" cars.

I also expect that if my Pontiac 400 engine ever suffers catastrophic failure or needs an age-related rebuild, I will be considering the possibility of a SBC conversion myself.