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[updated:LAST EDITED ON 23-Dec-02 AT 10:22 AM (EST)]Actualy Ford Motorcraft makes a conversion kit. and you WON'T need to switch to OBD-II. I beleive the kit is universal for the 300,302,351. But from everyone I know who has done a speed density-mass air conversion, they were never able to get it fully correct.
Motorcraft or Motorsport? The only one I've seen is for the 302 made by Ford Motorsports, but it can be modified to work with the 351 (I think it's just a switch in the order the injectors are hooked up). I don't think they would work with the straight six though. Unless you are referring to a different kit.