LD340 Can’t Get The Carb Base To Seal

So, I have an LD340 and a 4611S AVS carburetor on my 71 340 Demon, I can’t seem to get the carb base to seal to the intake manifold, I’ve tried several gaskets (all the same shape / type as the one pictured) but still get a vacuum leak around the bottom of the carb when spraying carb cleaner around it. Do I need a different type of gasket? I’m stumped.