You have everything you need in the engine to go in the 12 second range.
Your mph is very good for the cars ET.
Your 60 foot times are way off.
Remember that 1 tenth of a second in 60 foot is worth 2 tenths on the end of the track.
---------------------------------------------------------------------------
If I had to guess I would say the car is very slow off the line and getting good traction OR spinning it's wheels.
Knowing the answer to this question would help?????(spinning or hooking)
Also...What is your stall speed and gear ratio??????????
And where did your engine make it's peak torque on the dyno????
---------------------------------------------------------------------------
A) If it's spinning then adjust the pinion snubber 1/2 inch from the floor and keep the tire pressure as hard as possible without spinning ,plus make sure that a good burnout was performed.
B)If it's hooking good then it's the carb that needs adjusting.
________________________________________________________________
Having a good TORQUE CONVERTER BASED ON THE DYNO INFORMATION would help you out the most in the sixty foot.
You have enough power to go 12's.
Make it hook and keep the engine in it's max power band and your there.
Installing a set of heads next is the ticket.
I would change the cam last.