From my understanding, the timing marks are useless anymore due to how advanced it needs to go. Is this only true if I stay points, or is it the same with hei as well?
I don't know where you understood that.....................but no
What you do is, you use a "dial up" timing light (which I don't like, and have been trapped twice "back then" by ones which were not accurate) or mark the damper so you CAN read it far advanced. While you are at it, get/ make a piston stop and check the TDC mark for accuracy.
It's been a long time, but I seem to remember older Ferds were factory marked up to about 30? BTC. I never understood why they didn't finish the job.
