2.66 low gear vs close ratio

Now let's consider the 2.47 box.
the ratios are; 2.47-1.77-1.34-1.00 and the splits are 71.6-75.7-74.6 let's use 75%

I'll give you the short version first;
This box is for roadracing,
And for weekend bombers, and only if you can tune your engine to work with it, and not let it detonate itself to death. A lot of time and skill will be required.

Now the AJ version;
To get a cruise rpm of 2000@60 you will need 2.73s. Ok, we're in trouble already, cuz 2.73 x 2.47 = a 6.74 starter gear. So let's start over; to get a nice starter gear close to 11.5 we need 4.66 gears. Oops, you see where this is going right. Ok so let's compromise. #1 this box is out for cruising and out for DDs. That leaves racing and weekend bombers.For racing, and the go-to 4.30s you are left with 4.3 x 2.47 = a 10.62 starter gear. This will need a lot of clutch and a lot of launch rpm. Not the best idea, so that leaves just the bomber. Let's make it work.
We are gonna use the 4.30s. The starter gear is 10.62 and the cruise rpm will be about [email protected] earplugs.
Now the splits; Since it's a bomber we can put some cam into it, so let's say it power peaks at 5500and it wants to be shifted at 6300. Let's work it out;6300 x .75 = 4725 the drop-in rpm,so the powerband will need to be from 4725 to 6300 =1575 Boy-O-boy we're on to something!
So we can put a real tight LDA on that cam, and get some pretty good specific power out of it, and this combo will rock the quarter! Finally some good news.
Or is it?
The thing about this combo in a streeter is compression. An engine built like this, with the tight LDA will tend to build a lot of Dcr, with just a small Scr. So, detonation will be an ever-present possibility. It will always need the best gas, and a very well controlled timing curve.
The 4.30s will get old in a hurry. In city driving the constant shifting will soon wear thin, and you will wonder what you were thinking! But you are into it now for thousands of dollars and dozens of hours and you will not want to spend even more money on it.Before long it will be parked in the garage, and just occasionally raced...with high octane,high-dollar, race-gas. Cuz really that's all this combo is good for.
IMHO, I would not want this combo. I sold my 2.47 box a very long time ago.