Tuning help, please

Beams said

The old distributor was definitely toast. New distributor in from Halifaxhops. Back to the initial mopar electronic ignition setup. I got to drive it around for a few minutes this week. Verified TDC timing mark, filled up with fresh 91 octane, and topped off oil too. Rattle seems to be gone. Could use some more tuning—timing light still shows about 5 ATDC. I’ll just tune off of feel, I guess.

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Is 91 the highest youy can buy?
If so, and depending on altitude, the timing should be on the low side.
That said, depending on how Halifaxhops set the distributor up, initial should be 8 to 12*.
Initial timing MUST be measured at a known RPM. If this requires buying or borrowing a tachometer, then so be it.
Timing at 650 rpm will not be the same as timing at 850 rpm, never mind 1200 rpm.