Should I change my cam?!
This post is not to the OP.
My first response was gentle;
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.
Then I moved to an opinion
Would I run it?
not with 3.23s and a 2200.
and not with 145psi.
Then I offered my experience, and alternatives
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.
Then I restated the earlier conclusion
So I repeat;if you have already run this cam, and were happy with it, then leave it alone.
This was to the OP, as kindly as I know how to be.
My answer is always in the first paragraph or two, with additional data following. Because I have seen too many instances where the original poster comes back and has more question and then the thread goes to 4 pages... and more. So in the interest of thoroughness, I try to foresee those questions, and get them answered in the same post.
Generally the OPs have longer attention spans than some naysayers here. Generally the OPs are looking for advice, opinions, and reinforcement, cuz a lotof the time they have already have a game-plan in mind, or they just don't know; we all gotta start somewhere, and there are multiple ways of learning. So I try to cover the bases.
Then allhell broke loose.
You all know this is a crap-combo, but you just can't back out of the corner you painted yourselves into, so instead of owning up, you attempt to make me the fall guy. That's pack-mentality. That's high-schoolchit.
In any case, you naysayers don't have to read past the first paragraph; my advice was not for you.
My apology to the OP; you asked for advice but ended in confusion. Do what you think is best, and let the forum know how it works out, maybe I'll learn something for next time.