I have an Oliver 440 tractor that my step-dad got running by getting a battery and cleaning out the carburetor. It ran for a while, but after pulling out a few bushes and jerking it a lot trying to pull out a holly stump, the sediment bowl was filled with crud.  I drained the fuel and removed the tank and got about a cup of sediment and grit out of the gas tank. 

1)  I'm looking for recommendations for really cleaning the gas tank so that I can use &quot;liquid tank liner&quot; to coat the cleaned tank.

2)  I’m looking for a new Sediment bowl assembly so I can use the fuel cut-off. 

3)  I'm also having a terrible time finding carburetor rebuild kits for my 440. The carburetor looks like a Zenith. 

Can I use a 550 gasoline engine parts guide as a reference? Are there other equivalents, such as a Ford 9N, 2N or a Massey Ferguson that I can use?

Any help is appreciated.

BTW, my Oliver 440 is a 1962, according to the serial number.  I read on a post on TractorShed.com by Danny Berryman that there were only 200 Oliver 440’s made in 1962.  Now if I can only find parts...