blew up my 74 360 real real bad. so found one on craigs. took it home and saw regular bottom pulley but no harmonic balancer. checked engine stampings, yup it's a 360, w/ birthdate of 2/2/79. also has an aftermarket liitle plate w/ a series of numbers on it just below the head on the front of the block, drivers side. could this be a jasper or whatever reman number, and if they did something internally, would that explain no balancer? or did i miss a bulletin that there were 360's out there not needing external balancing? help please.