340 rear main seal leak/gush

Dan, I’m one of those guys who’d tell you that not all of us clock the seal offset like that.

You need to learn to fit the rear seal rather than offset it.

Think of that seal like a bearing and then tell me if you’d ever offset a main bearing like that and why you’d do it.
I've never in my life offset the seal and knock on wood have never had a main seal leak.