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I'd be interested in knowing what else may be done to the engine. Sounds like the pictures are of the air cleaner installed onto your truck, was the intake noticablly modded?
Thats what I was wondering about? No the other intake was an early J code just like mine in the photo. Look close you will see the piece that bolts to the intake that holds the base on as well.
The truck had a pyrometer in the cab but no other visible things?