Thanks for the info Tony. Again my ignorance comes into play.

Info I need to find out .. is the powerhead a complete powerhead or
does it require an engine rebuild? (maybe I am off on this completely)

Are the waterpump and fuel filter a definite or something that might be
required from a powerhead replacement?

I do appreiciate your reply. What is your experience in this area?

Any suggestions of a place or things to watch for when buying a new
powerhead?