Hi Andy, perhaps in the long run there may be some affect in having a different engine but Bristols are so rare, and unfortunately so unknown, in the US that I doubt there will any current impact. Condition is much more important as the cost of a restoration to original standards generally costs more than could be recouped by sale. I'd love to be able to update the Registry with your car details. I can be contacted at
mcgou@msn.com and would be happy to help you with any issues you have with the car, if I can. Peter McGough BOC NA Registrar.