If it already has a 350 automatic, someone propably altered the original frame mounts for the bell housing. So you are putting side mounts for the motor,a regular bellhousing(alum) from just about any chevy would work, you are going to use a rear trans mount. Just check the size of the hole in the bellhousing against the size of the collar on the front of the transmission.Some of those big 4 speeds had larger collars, you want one that matches the size of the trans you have.
