I thought the ones that did not have holes already pre-drilled in the front motor mounting plate were 1958-1962. If I am right, they are already there. If I am wrong it won't take long to drill them.
The side motor mounts are useless in your Art Deco or Advance Design for mounting the motor.


Deve

1950 Chevy 3100 Deluxe Cab
1950 Chevy 3100 Standard Cab
In the Stovebolt Gallery
The Think Tank
More info and tips at Deve's Technet