Gregsdart,
Your goal of mid 12s is definitely feasible.
I run 99 block, R/T cast heads (all stock), 9.3:1 comp., Mopar crate cam (501/511 lift), knockoff Air Gap, holley 650, 3000 stall, and 3.55 gears. First time out mid 12s without tuning on street tires shifting around 5500. Point is your...