1993 Grady white fly bridge

[Morning dew fishing]

Hey guys,

I just bought a 1993 Grady white fly bridge which I need to repower.
Came with 200hp two strokes, friend of mine is giving me two 450hp 2019 Mercury engines.
Those engines are 689lbs each, do you think the bracket can take the weight?

please help me on this

 

[glacierbaze]

How much does the old engine weigh? Has the transom ever been rebuilt?

 

[Morning dew fishing]

Transom was rebuilt two years ago according to previous owner.

mold engines was about 489, 1993 200hp Yamaha two strokes