Back in the old days, my 70 B would could be adjusted to idle or to run
under load but you couldn't get it to do both at the same time. Lean the
carbs to get a good idle and it had no power and wouldn't run above 3k rpm.
Strengthen the mixture to get good midrange power and the pig would load
up at idle. I didn't have a book and they weren't Holleys so I never
figured out what was wrong with the carbs. I just lived with the problem.
I told everyone that the cam was too big to allow a decent idle.
Anyway, you could have the same problem. You are lacking either fuel or
spark under load. I say fatten up the mixture a turn and see if it runs
better under power. If this fixes the problem I would guess that the jet
assembly is some how buggered. Maybe a seal isn't sealing or they aren't
seating after using the choke (or to be more precise, the enrichment
device).
Another thought- have you ever lost antifreeze? I don' t remember if you
said that you replaced the wires but, in the old days, soaking ignition
wires in antifreeze would ruin their dielectric strength and you would get
crossfiring. Just a thought.
Good luck,
Bill Eastman
61 MGA
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