Next I'm going to a chrome ignition box not the orange.My timing is at 36 , May need to be at 34. The distributor is the mp brown cap. I was told maybe spring change in distributor would help.
Getting rid of that orange box would be the first thing I would do. And get an ohm meter and make sure it is zero ohms to both engine and negative side of the battery.
The newer MP distributors are supposed to be adjustable as far as removing the amount of timing they have in them.