WICruiser First done a SBC in 1967 in a 53 3100 older hot rod pals said you couldn't do it. Don't have to bother the firewall,have the thickness of your palm between the corner of a tin valve cover and the firewall. Next use a 66big car manifold on the steering side,shim steering box out 5/8 inch. end up with your carb mount -up level. stay centered in the frame.used the short water pump radiator in stock location'was a 265 bored to 283 2 2121s carter AFB's 098 cam.worked good !!