The seller is ignorant or.. well.. ignorant.
All fords don't need aprtial choke to run.. if they did.. ford would have built them that way.
Adding choke does the following:
enriches the fuel /air mix
upps manifold vacume felt at the carb jets
needing choke to run indicates:
weak spark ( enriched mix fires on a weaker spark )
fuel obstruction ( extra manifold vacume can pull fuell thru a clogged port a little easier ..too lean of a mainjet setting can show up like this )
vacume leak ( the leak leans out the mix... adding choke enriches it.. getting it closer to normal.. )
Find the problem.. fix it. if it is the carb, and if the carb can't be fixed.. then repalce it.