Do you have an auto or m6 tranny, If yo have an auto, then you might look into beefing up your transmission, and if you have an Auto, then you might think about changing your rear gears... moving up to a 342. That will give you "off the line" power. A comp torque converter (2500rpm) or so will put more HP on the ground.
Sometimes you have to balance performance against everyday driving... These are great cars,.. but do we want to go so far overboard in the "MODS" to make them something that they were not ment to be. I think that unless you plan on spending 80% of your time at the track, keep your car as a comfortable, High Performance road car.
Spending a bunch on a "cam" , "heads" , etc ....WHY ? .... With the intake..Exhaust..and tune you have done, your car should be "Ripping" down the streets. Look at your driveline and suspension to put the horspower to the rubber. Go there first...
Joe B.