I've got the same trans as Stan, except I DON'T have a custom gear set.
That custom mainshaft for 1-2 is pricey!
His 3.10 1st is custom, as is his 3rd and 4th.
Stock 1-4 is 3.80, 2.06, 1.26, and 0.89. Which works well in a 1500 pound Spyder with 170 hp on a 3.44 final. I submit it would be REALLY nice to split 3rd, a little shorter and a little longer, and use the stock 4th as 5th. But that's not financially feasible in MY car. Unless it was built that way from the start.
Ed, that's a good choice with less power on tap. For those with heavier Speedsters, unless you have torque monsters, I wouldn't recommend anything taller than the 3.88 final.