Swapped out carb now she’s running so smooth. No slight backfire out the exhaust and no part throttle misfire.
Now wondering if my blue smoke on deceleration could be PCV issue. No smoke on startup and no smoke on full throttle acceleration.
Discovered that the carb is original and so is the block. I assumed that it was all exchanged as it’s got service replacement heads as noted by the X on centre ports.
How rare is a 455 HO Ram Air 4Spd A/C in 71?
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Ram Air IV M21 4.33 
www.brunoscars.com
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