71 LA 340 timings moved!! how?? looking for help

XE274H in that engine should run at 20-22 initial and 850-900 rpm. Verify the balancer hasn't slipped.
The OP needs to be aware that he has to modify the distributor to limit the mechanical advance if he puts in 22 degrees of initial and uses the stock distributor; without distributor mods, he will have well over 40 degrees of total advance (even without tany vacuum advance), which is not wise.