transom repair motor mount

Hello all; where can I find photos of how people have re-enforced their transom? I have a 1979 CAL25 with a Yamaha 9.9 which probably weighs about 130 lbs. The transom moves about 1/2 inch when torque is applied, I am worried it will eventually break. Original motor mount is 2in x 6in x 14in...

Greetings This topic is well versed on this forum in various threads, but I figure why not start a new one regarding my personal endevours. So this all started with the idea of repowering my 1978 o'day 25 with a new 9.9 4 stroke Honda long shaft. I'm almost certain the original mount is...