3 to 4 Speed Conversion

Yes; that would be 10% more TM making your engine feel 10% bigger on the start line. and thru every gear. The one and only downside is that it also increases your cruise rpm by that same 10%
My 367 is a powerhouse at low rpm. It's a dump the clutch and go deal. That's TM in action.
With the 2.66 low and 3.23s, she was kindof a dog on the start line, with the starter gear being just 8.59. My new starter of 10.97 increases the TM by nearly 28% . That is flippin huge improvement, easily compensating for the cam-change from a 223* to a 230*.
A 10.97 starter gear is equivalent to 10.97/2.66=4.12 with a regular 4-speed. But second is still the same 1.92. So your engine needs torque at the bottom of second gear, or else you have to carry first gear a few hundred rpm further. I like to granny-shift 1-2 at no more than 2800, cuz the pipes are singing sweetly.
I like 3.55s because top of second is 5100 rpm at 60mph, right on,or close to the power peak, of my 223* cam, making my zero to 60 about as quick as it can be...... whereas 3.23s is 10% less or about 4600.For street performance, it's really hard to better 3.55s, with a manual trans, and a 5000 rpm power peak,which is about a 268* advertised cam.
A 9.98 starter is still fabulous in an Early-A, cuz of the weight difference. You are easily 10% lighter than my 68 Barracuda tank. That's why I had to go with a 360; at 3650# (me in it) anything less would have been to slow-performance for me. 10 pounds per cubic inch is always a winner.
My comment was just supposed to be funny.Sorry, that it wasn't.