Before sending the carb off...
With the auto and big cam the rpm's will drop when in gear and the advance can will drop out and the idle suffers greatly.
Check your distributor vacuum advance.
When the car is in gear what is the vacuum reading?
Which advance can do you have in the distributor?
IF you run a B28/VC177 advance can (all in at 8" of vacuum) it should stay deployed when in drive and allow the car to idle.
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~JAG~
NCRS#65120
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