Dart falls on it's face.

YOUR LEAN LEAN LEAN :drinkers::drinkers: PLEASE GIVE THE MOTOR SOMETHING TO DRINK>>>This is your spark plug on a 62 jet :pale: (goast white)

\\\\ GO TO AT LEAST 68 JETS \\\\37 FRONT PUMP NOZZLE(SQUIRTER)
34 TOTAL TIMING

I have never went that low with a performance cam or rpm motor.
67 is the lowest i ever went, and it was too lean at w.o.t. power.
You will feel the power gain you just gave the car with a bigger jet.
Drive it for a while and then check the plug again.(same plug)after jetting up.