SBC 350 vibration cause?

Main jets are now 1426,
Metering rids are now 1456
Secondary jets are now 1424
 
It’s a carter AFB competition series. The number on it is 9636SA-0615. Indicates it’s a 626 CFM carb
 
OK...I thought you had a Holley. I have quite a bit of carbon buildup on my plugs..I want to put in smaller jets before I put in my cats....I'm running a 650. with 62 jets. Going to roughly follow your 7% decrees in the jet size. Thanks for the info.
 
I down-jetted the carb based on the 3000 ft or so Calgary elevation is above sea level. I had read it’s one jet size reduction for each 2000 ft? above sea level. I’m not sure if the exact elevation numbers.
 
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