7875 + 5.9 + E85 + Megasquirt

In Post #409 you show 3/4 PCV ports plugged. In Post #417 you still show 3/4 of them plugged. Under boost you are going to generate massive amounts of blow-by. I would at least have a crank vent on each bank. The provisions are already there.
Good eye! I do have a 2nd one coming from the front of the oil pan. If that’s not enough I’ll connect the other valve cover.