I'd lift the motor, the trans and torque tube can stay pretty much in place. My front motor mount has a metal shield on the top, just make sure you have all the necessary parts that make up this front mount. Maybe check a parts manual or go to 'The Filling Station or Chevs of the 40s to see what they have.

It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed