Sorry! Finally life slowed down a bit, and a buddy stopped by. out to the shop. Yes there is a hood bolt brace on the inside
of the fire wall. Raised and lowered several times, while watching inside braces. Firewall is flexing in corners from top bolt hole toward rounded edge where firewall meets cab. Thinking metel in that area has lost its rigidity. Think my plating idea would cure this, but will still considering any and all ideas!
Thanks to all who have posted so far, and for helping me and others with same or similar problem.