[Captainfab]

For engine mounts either '68-'72 BB brackets and mounts or the brackets from a '73-'87 C20/30 and corresponding clamshell mounts. If you switch to the short water pump, you will not have any issues with fan to radiator clearance. All trucks from '55-'72 used short water pumps on both small and big block engines. The '68+ truck frames have a narrower top flange on the frame in the engine bay for exhaust manifold/header clearance.