318 LA rebuild after losing a valve seat

With#1 at TDC (and #6 will be at TDC also), then if you line up the dots perfectly in line, with the crank dot at 12 o'clock and the cam dot at 6 o'clock, then #6 is firing.

But.... the cam can be ground off-index, sprockets can be made incorrectly, and you could have been off a tooth, etc. All of these things have indeed happened, and all of these issues have been reported and discussed here, and corrected. So the ONLY way to know for sure it to do the cam timing exercise. The fact that the oiling was off-index is not proof of incorrect cam timing but it is suspicious.... as has occurred to you already.

The distributor (ignition) timing is a completely separate matter. Either or both can be right or wrong.