Thanks Randy, I was just wondering since Rupp never used the HS50 but apparently the engine was available in 72. Figured since Rupp was competitive why did they not use that engine on some of their bikes?...
Also I was looking over the paperwork that came with my NOS HS50 shortblock and it looks like it's dated 1983 which sounds about right since its that blackish/grey color, but its old enough to use the points but not the newer electronic type.