Take the old one apart and find that the large T03 transistor is fake, and they use a cheap 5 cent T093 on the actual board. Remember the OEM parts were designed for 5yr/50000 miles. or in your case 45yr/50000 miles....
That is really sad. Those are simple ignitions. There is no excuse why someone cannot manufacture a reliable replacement for them. I just wish (now) that I'd stole more of them back when we had junkyards LOLOL
