Here's a photo that might help. Not stock brackets, but stock locations.The ones with the square grommets mount on a boss at the rear of the block, just below the rear head bolt. One of the rectangular ones mount to the right of the distributor (viewed from the front of the engine) to a boss on the block. The other mounts to the rear most bolt on what is essentially the intake surface of the left head. You will probably have to remove the distributor to get at this one.
