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I read some time ago , when I was looking at buying (well bidding on a FD 300mm f2.8 L on Ebay) , that Canon produced for a while a FD-EF adapter that was not made for long , the pro photographers demanded it.
I think it , unlike the adapters now available (which result in a 1.5x coversion of the focal length) , was a 1x unit.
A FD 200mm f2.8 with a FD-EF adapter will become 300mm f4.2 , you'd probably be better off buying a secondhand EF 300mm f4 , or a Tamron or Sigma equivalent to the 70-200mm f2.8 (LD or APO) with a EF bayonet.
I took a different tack , I bought a Soligor FD 135mm f2 , which becomes a 200mm f3 and produces very sharp images wide open . So I don't see any need to buy a EF 200mm f2.8 L or EF 70-200mm f2.8 L or other brand equivalents (LD or APO).
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