Ballast resistor question

The correct BR for that model is 0.5 ohm. That is for a factory ign coil. If neither part is original, I would check that the correct value BR is being used with the correct coil
I was surprised to see 0.5 but the parts book confirmed it.

(My old brain had remembered 1.5 for some reason. Also I misread the OP's post and have updated my post to reflect 1 resister BR. )

I would test it out of the cir ( disconnect one wire from the BR) and check that you are getting around that 0.5 ohm number.