Multi purpose suspension!

Spend your money where it will do the most good;compression and cam.
Those 4.10 and 88" tires will get you 100mph at 5200. So you need a cam to go there, like a 220/225@.050, which might take some compression to pump up the midrange. If you don't pump it up, then the 2500 is gonna be waaay too small.
Course the 3200/3500 you might be thinking of throwing at it, kindof spoils it as a cruiser. So IMO the compression is the better answer.
Headers and a free-flowing exhaust are more important than the 750 carb you may be contemplating. Forget the carb if you don't do the cam and headers; this is an all or nothing deal.
If you can only do one thing atta time, then
1) headers and free-flowing exhaust. then
2) cam and matching compression, then
3) carb and intake, then
4) stall, with a cooler, then
5) suspension
6) then start over with better heads, more cam, more compression and possibly more gear.
Along the way you might need to upgrade some of the other systems like, principally the cooling system, then the fuel system and perhaps the ignition system. Each change will require a retune, especially the cam/compression change. About the only change here that will help your 60ft is the stall and/or the compression boost.After you get some power, the next thing that will help the 60ft is the suspension.
Items 1 to 3 will increase your trapspeed. Items 4 and 5 will reduce your 60 ft, but if you do them now at your current power level the result will be not nearly as exciting; you can spend nearly a couple of Gs,in a heartbeat, for a couple to maybe three tenths, whereas an equivalent amount of money, in the engine, will take an easy second or more off the top, while if you are careful, not add significantly to the 60ft,lol.
And. I gotta tell ya, sliding and drifting is a lotta lotta fun...... which is why my 60 ft is 2.4and change, and has stayed there for decades,lol.Your 2.3 seconds is like mine except you are doing it with a chirp, while mine annihilates the 325/50-15 BFG DRs.
Your Duster is the lightest of the second gen A-bodies similarly equipped. And has about the largest rear tubs available on an A. You are well on your way to the fun-zone.