Need help keeping up with C6 Z06 & Porsche GT3 on Road Course

I've been reading a lot of posts about great handling torsion bar cars, including autoxcuda's car, Tim's '68 Valiant, dusterbd13's low budget build, Mitch's '70 chally, and the Hotchkis 70 chally.

Anyway, I'm square in the middle of a 5.7 hemi, tk0600, Dana 60 swap into my '73 Duster. My goal is to run with (or run down) my buddy's on a road course (porsche GT3, C6 Z06). Big goal, I know. The hp will be there (prob 450 rwhp), so I need to figure out the rest.

The hemi swap is taxing my wallet, so I can't jump right into a full hotchkis TVS or similar. So far, I've picked up andyF's 11.75" viper kit, viper calipers, the appropriate 73+ drum spindles, and 1.04" (250#) mopar perf bars. So, I haven't really set a direction yet for the suspension. Oh yeah, I have stock replacement leafs from jcwhitney (10 years old), with caltracs set up with minimal pre-load for street. KYB shocks. And the Dana 60 that will be going in has the big drums.

I'm up to date on autoxxcuda's current build (Hotchkis TVS, 1.14" torsion bars), and his last set up (like dusterbd13's). The set-ups I don't know much about are Tim's '68 Valiant, and Mitch's 70 Challenger. I've seen it mentioned Mitch has done 1G+ in the skidpad, which really impresses me. Can anyone tell me a little about what torsion bars and sway bars these guys are running?

Also, Hotchkis has a great line about "geometry corrected" tubular UCA's, and "geometry corrected" leaf spring set up. I'm guessing they're just talking about UCA's that can achieve the ideal alignment, or have they adjusted the suspension geometry?

My current thought is to swap in the 1.04" TB's, get a hellwig front and rear sway bars (~$300), Moog offset upper ball joints, align as best as possible (maybe do spacers? need to know more here), and then fit sticky 275's on all 4 corners (been looking into 275/35 18 - need to do some measuring). QA1's or Bilsteins from Hotchkis at the same time or soon to follow (~$400).

I imagine I could use a bigger sway bar for a higher effective Roll Stiffness, but I'm guessing since I don't know the ratings of the Hellwig or Hotchkis sway bars. I'm not opposed to swapping torsion bars, either.

What am I giving up by not obtaining the tubular control arms, adjustable strut rods, and adjustable steering rods from Hotchkis? And on another note, will my factory replacement leafs with caltracs suck on the road course? I plan on finding out...