Help me with A833 Gear ratio choice wide or close!

For a streeter
thirty-ish mph is where it's at. First gear with 3.91s and a 360 will be a smoke show no matter what, So do what you can
For instance; if most of your street driving is gonna be say 30 to 40 mph, then you are gonna need some juice at those speeds. If you built your engine for torque, then the peak will be around 3800, so you want to be at 3800 going into 30 mph. That would take an overall gear ratio of 10.19 with 27" tires.
With 3.91s that would be a 2.66 low gear
with 3.23s you could use the 3.09 box
with 4.10s you could use the 2.47 low.

At the other end you gotta deal with the Rs at cruising speed. At 65 mph;
3.91s will cruise at 3161
3.23s at 2610
4.10s at 3310

And finally, how about your second gear cruising rpm at 30 mph.
With a 1.92 second gear;
3.91s at 2800
3.23s at 2311
4.10s at 2930
With a 1.77 second gear;
3.91s at 2580
3.23s at 2130
4.10s at 2700

I use the ones in blue, because;
I can be cruising at 30 mph@2311 rpm ; I am Mr. nonchalant, all quiet and sneaking around.
But when I espy a buddy, I sneak up on him and with a flick of the wrist, I am in low gear at 3720 and my car explodes into a maelstrom of thunder, lightning and smoke, and she is g-o-n-e.
Yet she cruises 65=2311
So in conclusion;
I have run every fine-spline Mopar 4-speed there is, and with nearly every rear gear from 2.76 to 5.38s, and this is my favorite combo for a 223*@.050 cam.

I currently run a 230* cam and it likes 3.55s.
Does my 360 need a 3.09low? Probably not, but with a 3.55 rear gear, that 3.09 is a winner. My 360 does not notice the 1-2 split.......... because at WOT;
it burns right thru first,
and right thru second,
and sometimes to 85 mph, still in second gear.

If your 360 has some oats at 3400, You will not be sorry with the 3.09 low, and you will be swapping out those 3.91s in no time.
Besides, you can do what I do; just rev first gear to 6400 and let her drop into second at 4000, shazzam!