If it helps, I just set up my 451's distributor for a lot of advance on startup (but not quite full), then advancing gradually to max.
One superlight (Mr. Gasket 925B) spring for the low-rpm advance, then an OEM spring with a loop.
The loop engages at the idle rpm and its spring dominates thereafter.
So there's about 14 at crank (no kickback), 27 idling, 35 at 4000 and max of 38 less box retard at the high end
The trick is in finding the right loop length. I got lucky.