You are correct on the long and short exchange engines Taily, I wasn't insinuating GEM engines were a complete exchange engine including accessories when mentioning my Sandman engine. It was obviously and exchange engine done early in the life of my 75 HJ and with all the HJ engine accessories installed on it it looks original to the car which it obviously is not. It was meant to be a example of "just because it looks original to the car doesn't mean it is"