340 Initial timing questions

Yes, double/triple checked TDC when degreeing the cam (with piston stop) and compression is a bit over 9:1. I both measured and cc’d the bore/valve reliefs and cc’d heads, etc. ...so that’s a definite.

I was just curious why I could keep adding initial and it would still start OK warmed up on a 90* day.

I’m sure I’m fine at 22/34 timing. Seems happy enough with that.
(Vacuum can adds another 16 degrees.)