Car not running what is should, need help.

I started off with 72 primary and 80 secondaryand worked my way up, plugs looked a little rich. I freshened the motor last summer, it has about 190-200lbs of cranking compression. I did notice yesterday while driving in town while in D, it felt like something was dragging the car down. I checked rear brakes but they are fine so is the front. I wonder if one of the bands is too loose and is hanging up in D, 1 and 2 it does'nt do it. I ran it last year without the exhaust, but it still only ran 13.4 @ 101.
The heads have new hardened seats and guides and the seats and valves were touched up. I think the headers are flowtechs.