Not wanting to spend $4,000 swapping over to a t56 magnum, I thought I'd take one last swing at this tko 600. I did a bunch of research and found one blaring similarity with happy racers. Clutch Air Gap. I've seen claims up to .080 needed for a smooth shifting 600. So I went to work and was able to get approx. .050. That puts the engagement at the very top of the pedal travel and barely any air gap between the throwout and pressure plate. It's not getting any better with this clutch. I ended up using an allen wrench as getting into the starter hole with some feeler gauges wasn't my idea of a good time. You can see the allen wrench in the 5 o clock position.
Verdict: It still shifts like a John Deere tractor. I'm running the Mopar event at the speedway(Autocross/Drag Race) in April and then it's time to go 56 Mag. Hopefully I'll be able to hit 3rd and lay down a decent 1/4 mile time.