Slant 6 power issues

SpriceyStuff said

Yes I have a timing light and I used it. And like I said before, if I adjust the timing at all from where it is, in either direction, it stops running good, so I don’t see how it’s “unlikely” that I have the timing wrong. And I’ve tried pointing the rotor at cyl 1 when the engine was at TDC but it still didn’t want to run until I advanced it.

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Timing adjustment when the distributor is in correctly has a HUGE range of distributor movement where the engine will run "pretty dang good". I would estimate in degrees of distributor rotation "around" 30 degrees of movement and the engine will continue to run. At least idle decently. Your description describes a classic case of having the distributor one tooth off. You've had the advantage of a cumulative experience well of over 150 years combined. Several people have advised you to double check. It costs nothing. It's very easy to do and yet you refuse and fight at every turn.

SOMETHING is WRONG. Unless you double check everything, one step at a time, you may not find it and get frustrated and just give up. I've helped here enough. Have fun.