I pulled 2.0 60fts on a regular basis with my nitto D/R and with my street tires. I added drag launch springs and 10-way adjustable shocks in the rear. But no subframes or anything else. This got me in the 1.9 range fairly consistently if the track would hold. Adding the 331, I was able to pull a 1.86 on my D/Rs, but it was one of the first runs on the track that day. I couldn't repeat it.
Tonight we should have my 31 spline setup ready to go. Next w/e I'll be headed to the track with my Nitto D/Rs and my 17" ET Streets. I also added Sub-frames, and Upper Control Arms and Adj. Lowers. Once we get dialed in, I hope to drop my 60ft times of the D/Rs and then even further on the ET Streets. But to confuse it all a bit, I'm going from 3.73s to 3.55s. LOL