When I installed a Pontiac engine in my 1963 Chevy PU I used all factory parts. For the motor mounts I used the "Z" shaped brackets that the rubber half of the late 1970's Chevy' motor mounts bolted to plus those motor mounts. Those mounts bolt directly to mid-late 1970's Pontiac 3 bolt metal half of the engine mount. Since you already have the "Z" shaped brackets you should have little trouble mounting the engine to the frame. You might have to move either the "Z" brackets or the rubber mounts slightly but it all should work okay. Good luck.
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