Hi Ian. Assuming that you are installing a Delco 10SI alternator, you can install it with the original generator bracket. You will need to insert a spacer on the front of the bracket to bring the alternator pulley out far enough to line up with the pulleys on the water pump and the harmonic balancer. As I recall, it takes about a 1/2" spacer. Your stock adjusting arm will have an offset. You need to reverse the direction of the offset to get it to line up with the locking bolt on the alternator.
Not as spiffy as a new bracket specifically made for the alternator, but works fine.
Matt
