In stock form, Cadillac had two types of set up, a big ass cast balancer w/o a balancer (it acted as one) and a stamped steel pulley set with a dinky little balancer. That set works fine for low rpm (like dd) set ups. With a gear box, I'd run a balancer. We sell the BHJ and also make a hub with an offset flange for proper pulley alignment. Word has it that there will be a cheap replica of the BHJ before too long. SFI certified. When I say cheap, I mean less expensive.