For the record, I went in with sealing my carb to the intake with that in mind, and sought out an appropriate sealer. I selected this:
Amazon.com: Permatex 80060 #97 High Tack Super Gasket Sealant - 1.75 oz.: Automotive
"Resists gasoline, oil, antifreeze, axle lube"
Later on down the road, I decided to buy a #68 jet from SBP. Knowing that I'd need to remove the carb from the intake, I decided to also buy a three-pack of their Viton o-rings, just in case.
And it was a good thing, too, because when I took the carb off the intake, the 97b was easily wiped away, the consistency of old jelly, and a little bit slimy. My carb is now attached with just the o-ring, and it's doing pretty well.
Perhaps I am wrong to paint all claims of gasoline resistance with the same brush, but Permatex is a well known brand, and I'd expect "gasoline resistant" to mean a bit more than what I got. I can definitely
use Permatex 97b.
If you've got a better specific product suggestion, I'm all ears.