More importantly is that a Mustang in the rear of the photo? Camaro and Firebird man myself but could slum it with a mustang whilst I wait for a 67SS to drop from the sky or a 77 Trans Am ;)

The commercial printers we scrap always have tensioners on and the belt lengths are measured in inches (Short), if you can get tensioners easily enough than I'd fit them. They're sprung to apply constant tension and are adjustable.