in 67, it would have had a short water pump with the alternator mounted high and out. in 68 or 69, they went to a long water pump that tucks the alternator in tight on the passenger side- which, to me anyways, looks cleaner and less apt to throw belts, as the belt is shorter and the lower alt bolt goes straight into the head and the upper alt mount is braced on the intake manifold.
personally, if i was you i'd keep the long water pump setup- since it looks cleaner and stronger from a mounting stand point, and ps brackets will be easy to find, since they used that setup with a few minor alterations from 68 up to 87 or so in everything from 305 powered cars to 400 powered 1 ton trucks.
you don't plan sincerity.
you have to make it up on the spot.
wanna hear about 20 years ago when i was too smart to know any better?