Have you described the engine/car somewhere else?
I could Gonkulate it pretty easy but need a lot more detail.
Cold air / cowl induction?
Carb?
Intake?
Heads?
Headers?
Open or size mufflers & type?
Cam specs, .050 duration, LSA, advance, roller of flat, mech or hyd, gross/net lift?
Any dyno results like peak torq at RPM and peak power at RPM?
What RPM is the trans shifting at, 1-2 and 2-3? Guessing 5800?
x2 what bracket said about not loading it on the converter, if you already are spinning that's the wrong thing usually.
I guessed at your combo and a 3.73 gear made it about .12 sec quicker but that's a sloppy guess without the above info.
One easy thing to try would be, start off in 2nd gear, then just shift 2-3 at the usual (5800?) RPM.
When I did that in the Gonkulator it spit out this:
2.27
6.42
9.53 at 81.1
14.29 at 103.7
Point is, starting in 2nd gives you an easy but extreme way of testing the low-end of the car - how much does a really tall gear (eg staring off in 2nd) hurt it? Once we know that, gear changes can be gonkulated more accurately. A lot easier than swapping gears!