I have found that the valve cover and gasket for an industrial engine is different than a regular engine. Does anyone know where to find one. I have had no luck with NAPA or any other parts store.

If it is a 1986 it may have a hydraulic head and lifters in it.

In passenger cars and trucks this change happened for the 1981 year.

Try one of these...
https://www.rockauto.com/en/catalog/dod ... sket,10710

Or go back to your parts store and ask for a gasket for a 1981 dodge diplomat or d150 truck with a 225 slant 6.

Better yet post a picture of your lift's valve cover in the front right corner near the coil and we can tell you which gasket it will need.

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Thanks for the information, I will check on it tomorrow. It is hydraulic lifters so that may very well be the case.