I have been chasing a problem with my 292 64F100 for several months.   At speeds above 30 mph, I can feel an intermittant miss.  The miss stops if I accelerate.   I have changed points (US made), replaced the ground wire in the dist., no help.  Next rebuilt the carb thinking the propblem was in the intermediate  circuit and the power vaslve opening (upon accleration) was  feeding additional fuel.  No Help.  Today while checking the igntion again, I noticed the dwell dropped by 5 degrees when the vacuum advance opened.   Cap the vacuum line and the dwell remains steady at any rpms.   I haven't checked it on the road yet.  Will do tomorrow.  The dist. is a rebuilt unit about 10,000 miles ago.   I assume the rubbing block is not in the right place relative to the cam surface.  Theoritically, the contact plate should move without changing the point gap.   Am I all wet?   ANybody else seen this condition?  Thanks for the help.

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