Flexplate is not fits the torque converter

Achill said
In a nutshell- I have unbalanced engine, not balanced flexplate and balanced converter. Do I have an issue?

and yes, I’m confused and totally lost, looks like I’ll open my own shop for the flexplates...(now I have two).

No, The magnum engines are externally balanced. Tour flexplate is apparently for a internally balanced engine. You need to research your converter and make sure it is not balanced for the LA 360.