If motor is original and the tranny is not, I don't think it will have as much of an impact as if it is the other way around. From what I have heard non#s motors will have a 15-20% hit on the value of a done car. So if it would normally sell for $50k done, probably expect $40ish for non#s.
In checking the motor numbers, also make sure it has the correct carb, distributor, and shaker setup. These are very expensive items to find if missing.
What the car is worth is highly dependent on how correct and complete it is with all of its hard to get components.
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1968 Firebird 400HO convertible
1971 Trans Am 4-speed, white/blue
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