I am looking for the spark plug PN for the PCM 5.8L Pro Boss engine. When I recently pulled one and brought it up to the marina they said it was the wrong plug. I have always used the same plug, so I didn't purchase their recommendation.
These http://www.skidim.com/SPARK-PLUG-KIT-FORD-351-HO-Autolite-764/productinfo/RP030007/ If you still have the Protec ignition with TBI, looks like they should be gapped at .045. If you've had to convert back to points and a carb, I would think you'd gap to the carb spec .035, but would check with ski-dim for sure first.
