The Marvel-Schebler USX series (USX 29, 32, 37, 44 etc) is an accel pump-equipped updraft. It is sized for engines in the 275 - 325 cubic inch range. It was used on the Oliver 1750, 1800, 1850, 1855, etc tractors, and I believe also the JD 4010/4020.
My experience is USX is a VERY fussy carburetor to maintain and keep adjusted. Also most rebuild kits do not include the accel pump diaphragm (the diaphragm is prone to leak and always needs replacement when the carb is rebuilt). But when it's properly set it does work well.
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