Camshaft timing when the sprockets are ONE tooth off from straight up.

If the top sprocket has 26teeth @360 degrees, then one tooth is 360/26=13.846, by the math. and so on.
I can't recall the tooth count either.
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With an 8/1Scr-318 running the factory cam, with a loose chain at say 2* retarded(Ica of 54*) , which is 6* from where it shouldda been;
to one full tooth advanced on that same loose chain, at say
54 less 14= 40*ICA, the pressure is predicted to rise from 134psi to 147, at sealevel. At Ica of 40*, in this case, it is only 8* advanced from the factory install, using that stretched chain.
The overlap moves the same amount, but since the 318 cam only has 20 degrees to start with, and she is running logs, this is almost meaningless.
The Power stroke shrinks the same number of degrees as the compression increases, but since the 318 cam, in at split overlap, already has an excessive amount of power-stroke, 8>10 less degrees is almost nothing...... IMO.
Mine ran fantastic. Well, I mean I was very young lol, and to me it was light years more powerful.
I had/still have, an egg-crate full of stretched 340 chains and used sprockets, still to use up, so, I did it again on my winter motor, in year 2000. lol.
Com'on think about it, it's sort of like VVT! Advanced under power/ retarded by engine-braking; it seemed good to me. With a 2800 Stall, I liked it. I might do it again someday.