Boy, that's an easy question. :p I'll assume it was originally a 350 since you did not tell us. I believe it would be worth $10,000 at the most--and that is for a close to perfect car. I appreciate a nonnumbers matching car, but a car with the original engine/transmission is more valuable than with a similar nonoriginal engine. And it will be rather costly to find an engine and most likely rebuild it.

I would probably not pay more than $8,500 though.

I'm probably not close to other opinions, but I went first--lol.