Some years back I put a 455 in my 1961 Chevy PU using all factory parts. I believe the Chevy truck frames are similar through 1972. I used the brackets that the frame half of the motor mounts from a late 1970's Chevy truck bolt to. They bolt to the top of the frame rail and to the top of the front cross member. I also used the Chevy's large rubber frame half of the motor mount. I used the Pontiac metal half of the engine mount bolted to the Chevy bottom frame mount. I assembled everything then lowered the engine into the frame. Where the brackets hit the frame rails and cross member I drill holes and bolted it all in. It wasn't necessary to fab anything.
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