Don't mean to step on Red 53 pickup thread.

I just replaced my 230 with a carter carb. Runs good now. Went thru hell with the Rochester rebuild with no good results. If I recall, I remember reading where CarbKing said Rochester acc'l. pump diaphram is made of leather while the Carter's diaphram is neoprem(?) or rubber. And with today's ethanol gasoline if carb bowl dries from not running periodically the Carter diaphram with dry out and crack. If that's true, I would like to stay with factory designed Rochester to avoid problems in the future. Can anyone elaborate?

TIA