Without all the info it is a little hard but I will take a stab. I say if you can get off the line without spinning the hell out of the tires and keep the rpm above 2500 on the launch you should be able to get low to mid 11's. Using a four speed alot will depend on how hard you can get it to launch and how fast you can shift. If you are not good at either you could easily run high 12's or even low 13's in a car that should run 11's. When do you plan on taking it out ?