Should I change my cam?!

275/60-15s are `28 tall or 88" roll-out
With the 3.23s and a 2.45 low gear, those conspire to make 60mph =6000rpm@5% slip, at the top of first gear;therefore 30@3000
Having already run this cam,the P4452761, with a probable cylinder pressure of 145psi, just ask yourself; "were you happy with the performance".
If the answer is yes, then leave it in there.

Would I run it?
not with 3.23s and a 2200.
and not with 145psi.

I have an 84D100 with a smogger-teen, also at 145psi. But I run 3.55s and a 2.74 low gear with a 2800TC; no cam and just a 4bbl/dual exhaust. Oh yeah, with 275/50-15s it burns rubber all thru first.
The 2800 lets the engine spool up to where the torque peak is. The 9.73 starter gear multiplies the meager torque the smogger teen makes, and the ThermoQuad-4bbl rolls in enough power,once it opens, to keep the engine spooled up, and the tires spinning. That's how it makes fun.
Your starter is only 7.91, but because of your tall tire28 versus my 25.8s that steals another 8% off your TM. This makes your corrected starter to be 6.78 versus my corrected of 8.75, giving me 29% more TM.
My engine is spooled up at 2800, versus yours at 2200. I'm guessing that will make close to 100 ftlbs difference.
So at zero mph, and WOT you might be 100x1.29=129 ftlbs behind my smogger-teen. You'll never catch my smogger teen in first gear.
To put that into perspective, at 2200 your 268 cam will be 1.29x2200/5250=54hp down on my smogger.
Or lets say your 9.0/268* engine makes 150 ftlbs at 2200. This is 150x6.78=1017 ftlbs to the road
and say my smogger 8.0/240* cam makes 250@2800; making 250x7.91=1978 ftlbs to the road.
You see the difference there?
I'm just spitballing numbers. The accuracy is not important, the thing that counts is the difference in ftlbs to the road.
In my experience, you need a minimum of 1600 corrected ftlbs to the road to initiate a two fat tires spinning. And about 2000 to sustain it, long enough for the engine to get up on the cam. At your corrected number of 1017, you got a long way to go. You would need 5.38s with that 2200, or perhaps a 3200/3500TC with the 3.23s or simply put; more engine torque.
Given your "no other changes allowed"; the only other choice is a cam with an earlier closing intake, to make more pressure.

So I repeat;
if you have already run this cam, and were happy with it, then leave it alone.