Steve - I'm unsure what the stock float level is for your carb, I'll have to check my '72 service manual. It's quite a bit lower than 5/16" I'm fairly certain.
Answered your PM as well, my friend.
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Regards,
"455HO" Lloyd
2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98
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