Breastman
I have a Quad 4 barrell on my 350 chevy inbd on my V 20. Check to see if the throttle linkage bushing are wore out. If so then get a another carb, you can rebuild any carb unless the throttle linkage bushing areas are not sloppy. They will suck air and you will never get the carb to idle right.
I'll get you my numbers off mine but my numbers are VOLVO Penta numbers and may not mean anything. I was looking on replacing my distributor with a new one and I found out the numbers on it were Volvo Penta but I couldn't cross them over. I just went and looked for a 1991 350 distrib.
If you decide to replace cross check your carb number to see if it is a 350/400/600 cfm carb and then just get 1 for a chevy. Spareparts and Them can probably help you out figuring what those numbers correspond to cfm size.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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