setting timing with crank trigger

[1970chevy]

trying to set the timing with a crank trigger i am running a 84697 dist and msd 8620 crank trigger i put it on #1 tdc i have the rotor line up with 1 cyl on the cap the i have the pick up in the center of the magnet i have the balancer on 36deg tdc i tryed to move the pick up silder both ways it gets a little better when i slide up to the motor its still back fires through the carb
thanks