Dam it never fails , rite when you got it all right , the TSI TRANNY shows me a week link

you dont need 400HP to bust a flex plate. All you need is the wrong convertor in the right trans and a 318 (or a line bored block with no alignment dowels). Like me.....I didnt put in a T-flite Paddy 1/8 bushing on my old small nose snout convertor into a later crank. My fault, mine didnt bend all up like yours though, just cracked and a piece fell out bit it STILL turned the motor, and got me home! Every leg of the flexplate was cracked through and fell apart when I unbolted it when I got home. Very lucky.