How do you know it is missing? My idle is quite rough and "seems" like it misses, (motor shakes a little), but drives smooth. A large duration cam can cause a rough idle, like a Ram Air IV...
Nozzle drip in the carb can cause it to seem like a miss.. What are your compression readings?
Mine are all at ~165 cranking give or take a few pounds with a Ram Air IV cam and stock 1970 #12 heads..
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My 70 Judge Restoration documented at: http://thejudge.dyndns-home.com:8080/
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