Crazy idea but if u just unhook one pcv and leave the other hooked up does it idle better. I personally was told to hook my pcv to a vacuum port straight to the intake and have had no issues. Just an idea. Maybe try that and see what it does. Maybe having two hooked up is causing the carb to get too much of a vacuum signal or draw? Hope that is of some help. If not, disregard this post! Lol
Sounds like your distributor is hooked up to the proper port. What the fellas have posted above I think have nailed down ur problem. I did'nt think it clear through, but 2 pcv's can't operate properly on that amount of vacume produced, thus only creating the formentioned vacume leak. Be gentle while kicking me to the curb.