Distributor advance springs

SpriceyStuff said

It starts to barely knock right before every upshift, then once I’m in 3rd, it starts to knock on freeway speeds. I’m fortunate that I have alternative routes to work, but at least now I have time to mess with it. On the other hand, I know that the issues was WAY worse before I put a new timing set on it, which I did just a little over a week ago.

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That is very load sensitive.
My suggestions are:
1 verify the #1 cylinder TDC and the timing mark on the harmonic balancer agree, if you didn't check it at the time.
2. Measure timing vs. rpm to the extent you can. With a timing tape and/or dial back timing light you can cover a greater range but even without those you (we) will have some information work to from.