The best thing I have seen to do with a Mopar points ignition on an actual driver is replace it with a trailbeast ignition or similar. Champions work good as long as the a/f mixture is right and you don’t have any excess oil burning. I have used champion copper plus truck specific plugs (don’t remember the number, \6 with crack in bottom of intake, constant egr system) to get by until I could fix i. It would foul out a regular set in a week, truck plugs never showed a problem but went up two heat ranges to compensate. Didn’t run too good but got me where I was going.
