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IDA's were factory fitted first, I'd guess, on Porsche's.
DCOE's a wilder guess: Alfa's.
DCNF's: Ferrari and Maserati.
All during the 60's... Or maybe early 70's. You'll find the hitory in some of the books written. Pasasni (if i remember the writers name correctly...) have some notes on where the carbs were first seen and so on. although, I cannot tell you what book gives the best historical view on the webers.
What I can say is that I once stumbles across a book "Das entvicklung und -
funktionprinzip (?) des Vergasser" or something like that by a German engineer.... 500 p. or so?
None of these carbs were common in the day. Not to be seen on any veichle on your street....
The IDA's have changed some during the time passed. The bolt pattern on the 2- barrels should be the same, whereas other things are changed. A swap has to include some re- jetting and other small changes.
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