No, that's not going to work once the headers are on, if you can even get them on..
The ends of the Z-bar are gonna be moving in too many directions at once.
Take a very close look at Post #6, which looks just about perfect.. which is what you want.
To me, it looks like your engine is NOT in the right place. She appears to be too far to the P-side and too far forward, and too low. But if that was true, then you would have had a lot of trouble installing the rear crossmember.
If you didn't have that trouble, then I gotta suspect the frame-end is in the wrong place, which makes more sense.
I suppose, I would check the K-member placement and/or the frame geometry. The FSM should detail that.
I feel your pain; Slow and steady..............