A500

Now that could be exciting.
The A500 has ratios of 2.74-1.54-1.00, as compared to the A904s 2.45-1.45-1.00. That is an 11.8% improvement in starter gear, and a 6.2% improvement in second gear. A cam is about 5% or 6% improvement, in power, often at 5000rpm or more, and sacrificing off-the-line torque to get it.
So the A500 is an easy way to get that bottom back.
These ratio improvements mean that with no other changes except the tranny, the engine will feel, in first gear, like it gained about 12% more cubic inches, and in second it will feel 6 % bigger. 12% is 40 cubic inches. 6% is 20 cubic inches
Unfortunately in your case, the new starter gear of 11.23 is gonna be a tire fryer in a hi-compression 340. So you are gonna need a traction aid.
And the 2.83 final drive will bring the cruise revs down to about 65=2285. So easy on the cam. Let the tranny do the work.
With those 4.10s, 65mph in second gear will be 5100 plus TC slip; so perhaps 5300rpm.This would be perfect for a cam that peaks around 5000 or a bit earlier. Perhaps a 262ish cam. You are of course free to select any cam, but it won't necessarily make you any quicker to 65.
For a Streeter,there would be no sense in having anything bigger, except to make you sound tuff.And to suck gas.
To be quicker with a bigger cam, there are just three ways to do that;
1) get a traction aid to limit your wheelspin, and
2) get a higher stall TC, and
3)lose weight
in that order,lol
Any improvement with the bigger cam,will only be in first gear,and mostly in the 60ft with the traction aid. Also,the bigger cam will need to be revved up higher in first, prior to the shift.
For example if you had a cam that peaks at 5600, it might want to rev to 6100. But the new tranny will demand at least 6800. That is 1200 over the peak to come in at 1800 under the peak. 6800 at the top of first gear will be 46 mph(with 5% TC slip). Then she gets to claw her way up from 3820@46, to [email protected]'s gonna be a bit of a tough climb.
That tranny will want a wider LSA than the more common 110*, to help the engine make torque to cover that huge 1-2 split of 56.2%.This will steal some absolute power, but increase the average power.
So like I said easy on the cam, if a streeter.

Whatever you do, it is sure to be exciting!! Good luck