I've already upgraded to a 7" dual booster as seen in the pic below. My original has been stored away for several years. The 2nd and 3rd pics are the best I could find showing the original unit when I did my efi swap 10 years ago (don't mind the engine engine bay clutter lol, doesn't look like that now)...master cylinder still attached and never had any issues out of either. Shoot me a PM with offer, honestly not sure what it's worth.
