66 mustang 6 cyl hesitation

First post here. I have a 1966 Mustang coupe - as simple a car as you can get. ^ cylinder, no a/c, no p/s, automatic. Was stored for 12 years - have replaced all the fluids, ignition components (cap, wires, plugs, points, condenser, rotor. Timing is dead on at 12 BTDC. Installed a rebuilt carb...