Ballast resisters

I have a question about ballast resisters i converted my 69 318 barracuda from points to electronic ignition. I'm using the orange box and also have a chrome box available. I checked the ohms on the old ballast which measured .8 ohms but i also have a ballast that came with the kit that reads 1.2 ohms which one should i use for the electronic set up? These readings are checked with nothing hooked to the resister.
Thanks
In advance
Pat Faley
67 NB barracuda
69 barracuda convertible
The other issue is I noticed with the 1.2 ballast hooked up it gets pretty warm to the point at one point it melted the end of one of the plugs and the back of the ballast is all cracked from it getting so hot I guess. What would cause that?
Pat