Bracket for 20' Master Angler

[captbilly51]

I've bought a 1978 20' Master Angler w/ a questionable transom. I am planning on doing a full reconstruction with this boat. I'm considering a bracket to mount a 25" 150 or 175 hp motor. I would like to have a full transom to increase cocpit space. My concerns are changes in center of gravity & handleing. Are there any idea's or experiances out there that could help me.