Several years ago, I posted information about the various gaskets used by Rochester on the B series carbs, and the importance of using the correct rebuilding kit(s). Others posted there was no need to go to a specialty vendor for an expensive kit, as the $11.95 parts house kit had everything needed. Here is some documentation to show differences. All of the gaskets posted are genuine Rochester from my engineering sample files.

This yet another reason why we demand tag numbers when we take kit orders so the correct kit is sent.

Jon.

http://www.thecarburetorshop.com/B_airhorn_1.jpg

http://www.thecarburetorshop.com/B_airhorn_2.jpg

http://www.thecarburetorshop.com/B_airhorn_3.jpg

http://www.thecarburetorshop.com/B_airhorn_4.jpg

http://www.thecarburetorshop.com/B_airhorn_5.jpg

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop