I have been in the Hotchkiss T/A Challenger & it flat out handles !!
It makes a big difference but in talking to them they figured roughly 1/2 the gain was suspension & the other 1/2 is in the wheels & tires .
welll you have the tire part handled for sure , good tires !!
You could use the spring relocation kit with offset hangars & shackles moving the springs inward , you just need new spring seat welded to the diff , $12 from Mopar last time I checked + you cam correct the pinion angle