Clothespin only works on Studes! And some Fords!
Quadrajets normally don’t have fuel percolation problems.
If you have a hot slot intake and the wrong base gasket they might.
What choke you got?
Post a pic of your carb.
Could see something amiss.
Info here on the ‘infamous’ hot slot intake.
https://www.corvetteforum.com/forums...d-problem.html