68-72 buick 350 frame and engine mounts, should be easy to find. Also remember that if you have a chevy trans in the camaro it wont fit the buick, need a BOP (buick/olds/pontiac) trans with the correct bellhousing. You can do this but really there are so many chevy engines out there I dont know why you would.
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Dave (NY)
66/70 chevelle ss396's
72 chevelle
69/71 camaros
55 chevy prostreet
61 impala bubbletop