Like to switch to another carb with ajustments help

#1
Hi all i have a tecumseh model 143.98 5005 engine family stp172u1g1rb displacement 172 sears 7267b the carb i have is a 640017 it has no ajustment and would like a better carb what would it be and i realy heed # guys i dont mind getting from evilbay and can anybody tell me anything about this motor im really a briggs guy thanks for your input dave
 
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