Im not much into 1/8 mile but those look like really good times... My best with my 331 (NA) was like 7.8 or something and that was with a 1.6x 60' on slicks and one hell of a launch.
I use a 26x10.5x15 ET Streets mounted on Pro-Stars.
Suspension setup is UPR Solid uppers and lowers with Race Urethane Bushings, Eibach Drag Springs, Lakewood 70/30's up front and 50/50's in the rear, no sway bars. Just changing the suspension the car went from 1.9 to high 1.8 60's to a best of a 1.69 on motor launching at 4500rpm and I have even dipped into the 1.5's on the spray. Man I love this set-up rides great on the street/highway.