What should i change to get into high 11's?

The four times I raced at the track my mph was in 104-106. 12.9 at 106 being my best time. I have nothing done to the rear suspension at all other then the SS springs. I have not weighed the car but I only weigh 140 so I am taking a guess at 3300lbs. I feel like I should start by adding in some shocks in the rear, possibly some rancho's (after reading a couple posts on them), then adding in some subframe connectors. Should I use a pinion snubber with SS springs? After that I think I am going to follow bobs advice and advance the cam (since it won't cost me anything) and add a better torque converter. I am running a 727 with a transgo TF2 shift kit, a 4.2 lever, and I believe red alto/kolene internals. I called dynamic converters and was told 595 for a 9 1/2 converter and have also looked at cope racing trans for a 9 1/2 converter for about 500.