Update:
So it's been slow going, and have had several engines for the bike, including a Lauson and a SWEET silver colored 1960 Briggs 3HP with a Updraft Carb setup. Both engines fit but, they just didn't quite do it for me in the looks department.
I believe this is THE ONE !!! Big thanks thanks to member Boat Guy for working with me to procure this sweet engine and also thanks to Chad (minibikin) for snapping the pics of it at Windber for me.....:thumbsup::thumbsup: