I think Thor's right in what he says. My own view is that for a car like a bristol the recipe should be effortless torque and tall gearing to take advantage of that torque. Just how bad is your fuel consumption? Have you checked the basics, eg the ignition timing vs the handbook vs what mopar forums says suits the 360? I say that because my 383 ran very flat when I bought it but the timing was as per the main handbook. However I found an addendum that said 5* more advance for chassis numbers including mine. Mopar forums thought even that was too conservative and wedge heads liked to be in the high teens advance at idle with the vac advance disconected and plugged. And lo, it runs a lot better.
The overbore wont make any difference. Forums also say a good carb for normal driving is the Edelbrock AVS - v good fuel atomisation for a carb, giving good driveability, which is what's needed.
Good luck with it!
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