Hi Andy,
A classic car with a non original engine is always going to be worth less. That said there are a few Bristols around with non original engines and the factory have been known to "upgrade" and modify cars.
However a 340 six pack seems more appropriate for a street race car than a Bristol 408.
Do you know whether your car is a 408 or a 408 Mk2?
If I were you I would source an original A series 313 or 318 Plymouth engine (NOT LA series) and at least have that available if you sell the car down the track. Being in the US that should be relatively easy.
Did they change the transmission also?
a 408 would have a Torqueflite A-466 and the 408 Mk2 the A-727
If you post the chassis number on here someone should be able to tell you whether it is a Mk2 or not.
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