Now I"ve got it heading for kit form, maybe some details might prompt an ID?
Looks as if there should be a shaker tray, judging by eccentric pin and narrow belt land on inside of main pulley.
Spring tensioner looks unusual?
Traces of paint on inner parts is a sort of duck-egg blue with outer gears etc red; possibly a hint of white under all the crud on the timber.
With the KX casting marks could it be early IH?