Hello. I can't really get into recommending cams as it tends to be highly speculative, but a 408 with a well-built 360 should be fast enough for anybody. It may well be that the carburettor and distributor could be better adjusted for idle and low-load running (which is 99% of all running in a low-drag lightweight car like a Bristol). For every-day road use the cam should be either one of the hotter factory cams, or a very mild street cam. A set-up which might work well would be to use a truck or RV cam and a low-stall torque converter, but who knows unless someone tries it (?).
A Holley Sniper might a be good route towards improving things if you take some time and patience in setting it up carefully.
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