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If you rule out the fuel system, you might want to consider changing the coil. I seem to recall that a coil can fail gradually and when partially failed can cause power loss under load. Re: distributor caps - if a cap is cracked and it is arcing internal to the cap sometimes "carbon tracks"...

Seem to recall a rule of thumb re: backfiring. If it backfires thru the exhaust it's fuel related. If it backfires thru the carb, it's ignition related. Also recall that a bad ignition condensor can cause the symptoms you describe. Like others have said, change the points AND condensor...