Ideal shift point article

As to splitting,yes.
As to splits; if you have two gear ratios; one of 3.0/1 and one of 2.0 to1; The rpm drop going from the granny to the second is 2/3 or to .66666 of the shift rpm. Shifting at 6000, then the rpm will drop to .6666 x 6000=4000. Thus the rpm drop is 2000.
That's how I do it.
I ran 4.88s on the street. And I ran 4.30s on the street. And I ran 4.10s on the street,and I ran 3.91s on the street, and I ran 5.13s on the street,and I ran 3.55s on the street,and I ran 3.23s on the street.... But never 4.56s
With a 3.09 low and a GV you can run anything.
4.56 x 2.66(the standard A833 low) nets a starter gear of 12.13. Using a 3.09 low this would require just 12.13/3.09=3.925.
I found this much gear-reduction (12.13) on the street to be semi-useless,a tire-burner. A hot 360 stick-car,with a street cam and adequate compression,needs no more than about 10.00 starter. 11.00 tops. Otherwise I was grabbing second almost right away. Or I was moving out like a Mustang; reving it out to over 3000 before shifting. That's just sooooo wrong. That's for 5.0s. I have a 6.0, and it has way more torque. Shoot I can shift it below 2000 when I'm just tooling around. Well below. It's a 6liter for Pete's sake.
While big-number gears can be fun;IMO, on the street, they are more or less just trading away hi-way cruise for tire-smoke. That's the conclusion I came to,anyway.