Got a picture? These wouldn't look like a GM HEI on the cap and such and a Mopar bottom half? If so...
Stay away, far away. Someone figured out how to mate a GM HEI cap/coil/pick up assy to a Ford bottom shaft assy. Had a friend go thru 2 on his Ford. Top bushing seized twice on two different units and it somehow grabbed hold of the pick up unit/ring and ripped it off its base. Cost him two races...