How much ET will i pickup with following changes

Good luck, on a soft launch, what's tires ,and chassis set up ,in perspective?...

275 hoosier DOT radial, ladder bar with single adjustables, stock front end with singles..... 69 Dart
I leave at 2K off the foot, shift at 6, was trapping about 6200/6250 . Car was deadly consistent in the 60 foot from outing to outing, just fairly doggy
Might bump it up couple three hundred revs. Bone stock 360 bottom, so havent really tryed to lean on it.