I have a allis B-212 that my daughter and I are going to rebuild. But I dont really Know who to get in touch with, for engine parts or kits. And does anybody make gas tanks for these tractors?
For Engine parts try Tulsa Engine Warehouse. TulsaEngineWarehouse.com - How To Guide: Repowering With A New Engine
They have or able to get lots of Briggs, etc engine parts. Gas tanks too. Though those Briggs tanks are Very pricey ! Ebay would be another source. I've bought several (Briggs gas tanks) on ebay at different times.