Hello. I will be getting a '69 Firebird soon. I've had a '68 Camaro and '70 Nova, so I know the sub-frames for all these cars are similar. I want to put a Chevy straight six in the 'bird while I search for a Pontiac OHC engine. I have Chevy frame mounts (engine towers) that are for a '69 Camaro or Nova. Can someone tell me for certain whether the Firebird's sub-frame will have the holes drilled in it so the Chevy mounts will be easily installable?