Base timing. Really ?

the 2-stage works really well with a manual trans, where the tires are married to the road.
Like in direct gear at passing speed where the rpm is low, and the loading is high.
I have 3.55s and so, at 55mph, pulling out to pass a guy, still in 4th gear, The Rs will be ~2400. And I burn 87E10 exclusively. There is no KD cuz it's a manual trans, and there is no way my 367 can break traction in 4th gear. So the engine HAS to not detonate, when I floor it.
That is the type of condition I use the 2-stage for.
By experimentation I found that my engine was Ok with up to 28* at 2800 at full load/WOT, in any gear. Yours may vary.
After that I just hoped for the best, which turned out to be another 4 to 6 degrees at about 3400. That was close enough for me.
But I have heard that BBs like more, so experiment carefully.