X O U or J heads on a 416?

Guy went out of business years ago. Was known for "grossly" exaggerating dyno numbers. His engines typically made about 150 HP less than "advertised" backed up by real world testing.
my current shortblock he originally built. Got it very lightly used( one summer while guy waitEd on his hemi power train) from a guy on the other side of the state
the shop I use( excellent reputation) had to fix pretty much everything he touched on it.
Terrible bores, no fixture used, was tubed for roller cam, all the lifter bores on that side we’re wallowed out at the bottom, had to bush all the bores, on and on.