Clutch pulley pic

I have a 1972 model SS15, missing the clutch pulley/spring assemlby. I believe the assembly may bolt to the rear of the engine ?? I need someone to post a couple of pictures of this area showing the belt/linkage. I will be fabricating some brackets (different engine combo) and need a starting point.

Also, this will be a pulling tractor, and I will need the best belt tension possible - with reasonable pedal resistance for a young driver. Anyone with ideas for improving the drive belt performance, post'em up. Thanks