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Hi , are these sparg plugs (Motorcraft Platinum AGSF32FMF6) interchangeable to my GT40 F3ZE heads. ????

Yes. And heat range 3 (5th number of the plug) is a good starting place for your engine as well. Note that you must re-gap them for performance at .050" (1.27mm). They come out of the box at about .060", and that's what the last number of the plug indicates. It will run with .060" gap, but will likely misfire at higher rpms.

The condition of your ignitions system will determine the gap. If you have WOT high-rpm misfire at .050", close it slightly to .046-.048 (1.15-1.20mm). You want the widest gap that will give you 100% ignition.

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