I would say that you have the wrong motor mount. The ARM bolts to the outside on the motor mount. Go get a motor mount for a 1967 Camaro, There are two styles, one is short and wide, the other is tall and narrow. measure the mounting pad before you go to the parts house so you know which one to get.
You can get "lifetime" mounts from AutoZone for about $7.00 or so.
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Kelly
1951 Chevy 3100
1967 RS/SS Camaro