call spec and talk to them, i had a 3+ in my dart for a short time. had a issue with it slipping. sent it back to them and they fixed it up. hit so hard when i got it back the trans broke. then i decided i needed a slipper clutch.. still have it, sure i'll use it in a serious street car one day.

68 Dart GTS "HEMI" 10.30 @ 131 pump gas street car 3780#
69 Roadrunner 511 six pack 10.92 drive to track street car