Go to eBay, type in "Ford 200 Distributor" and see what pops up.
I just did that and there is a couple on there for $50 or less shipped.
Any year from 65 and above for a 200 should work.
Be careful of any distributor 64 and under, they will more than likely have the 1/4" pump shaft; you need one for the 5/16 shaft.