[SPF1061]

I think all of the advice you have received is pretty spot on. I will say that you do not HAVE to build a one trick pony to get the results on the drag strip you are looking for. I have a Superformance with a Roush 427R/.82 TKO 600/3:23 Torsen differential in a Ford 8.8 rear/every suspension upgrade offered by Olthoff Racing. I drive this car on the street, road course, auto cross and drag strip (pushing 45,000 miles in 7 years). I mount a pair of M/T 275/15 Street Radials on the back and drive the car to the local drag strip about once a month during the summer. I don't check the plugs, timing or rejet the carb. I just climb in and go. This is my best pass from last Friday :
1.768 - 60 ft
7.357 - 1/8 mi
11.372 - 1/4 mi
123.32 - trap speed
You don't have to have a purpose built "Cobra" to hit the times you are shooting for.