Yes I think I have it. It is moved far to the passenger side with a 3/8" shim on the driver side and I can spin the coupler so long as I take the cover off that. That gets caught at the corners so I will trim off what isn't needed to clear the header. I've got a cover, seal, and wire clamp coming as part of addressing that.
I could move the engine over further - I've had it over further while it was all out of whack - but I'm trying to avoid that on principal.
I am also considering a truck mount on the driver's side to get rid of that stack of shims. AFAICT, those are about 1/2" thicker.