Bristol 401 low on power
Before doing anything else, take the car to a competent shop and ask for a compression test of all the cylinders. The factory service manual should give that specification, but without that data, look for about 150 PSI as a starting point, perhaps lower, but all cylinders should be within 15 pounds of each other. Now, it the compression is good, then it may be a simple matter of the engine not getting enough fuel or air. Could be the carbs or just the fuel pump or a clogged filter.
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