Yes you can use an adjustable FPR with a carb. Thats the only way to adjsut fuel PRESSURE. Now if you want to adjust the amount of fuel delivered, you change the jets. As far as changing fuel pressure while your in the car and spraying, Ive never seen anything that would do that.
Bradley
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1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbos, FMIC, T5.
Built Ford Tough Moderator
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