Misfiring issue

You did not say if your running vacuum advance. One thing I would do is to set your timing at 38 degrees, with full mechanic advance at 2600-3000 RPMs with no vacuum at all. If it was me I would drop the fuel pressure to 7 PSI and run it with the timing and fuel pressure adjusted. I always run the Mopar Electronic ignition systems and this set-up works for me. Just my opion.