Lot's of conflicting information.

You can rebush your original carb yourself, if you feel comfortable doing so.

http://www.throttleshaftrepair.com/

that would be your cheapest option.

These guys can get most of the rest of any parts you might need for your original carb.

http://www.walkerproducts.com/catalogs/

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.