Check not only the belt but get the alt checked. On another note of craziness...At the mopar shop a mechanic was switching from mopar electronics to MSD. Car started for a second then shut off. (512 motor)..Car would crank but no start. All wiring/ground were correct. Solution was the diode in the alternator went bad. Replaced alternator and car runs fine. Also as a side note..runs 6.80's in 8th. Figure that.

Also...Chrome alternator pulley's, like mine, tend to slip a bit more than stock pulley's.