Volks-Swap :: The Subaru Conversion :: Torque arresting an EJ20T

I am running on speculation, as I havent gotten my 05 EJ20 Turbo installed yet. But my concern is the torque of the motor could really mess up the transmission horns on my 69 IRS chassis. My hope is to build a Kafer bar and tye into the upper transmission mount on my subaru gears TY75 flipped diff transmission.
I would like to know what you all have done on your rides to solidify the motor in the chassis.
Im using a full 944 turbo brake and suspension system in my Sterling Kit car including traction bars.
Do I need to seam weld the transmission horns? Anything else?

Thanks in advance!