Has it been changed over to electronic ignition? If steel using a 2 plug instead of 4, then you need a 2 plug for electronic ignition or it will get hotter then post to, best I remember it was 1ohm, I got one from summit years back, but looking on their right quick I did not see it, but other place's have them! http://www.sears.com/new-mopar-performance-p5206436-ballast-resistor-for-1/p-SPM5979329405