hi there
ok, well the alt bracket on the cylinde rhead is not factory.
your best bet is going to get a complete matching set of alt and p/s brackets all from the same SWP sbc engine
72 was the last year for SWP on the trucks yes and were driver side alternator still
the pic of the p/s brackets you showed is the old swp style that reaches back to the engine mount
and this is how at least the trucks had them
cradle type pump brackets
the truck p/s pumps mounted very low
the pump in your pic is a SWP vintage pump and will work for the waterpump and vintage you have
here is a '69-72 chevy truck SWP lower cradle alternator bracket that bolts to the cylinder head with two of the three bolts in the end of the head:
the cast iron cradle bracket on this p/s pump is the 72-older style truck one, also same as found on the 79-older vans, they all bolt to the front two block bolts downlow by the freeze plug, the stamped steel bracket single bolt hole bolts to the front exh manifold bolt- but is meant for LWP 79 older vans with the below spark plug log style manifolds such as in the same pic. so just disregard it:
now this is for truck style SWP only
i dont know on the car style brackets., as they differ from trucks and changed many times over the SWP years.
so this is why you need to find brackets all from the same vehicle/engine with SWP, also pullies, so they will line up.
this is why when i junk vehicles i keep all parts like this in crates,
they come in handy often.
we could be here all year trying to find and post all the different SWP style p/s pump brackets gm used from 1955-72
theres just billions of them. you have to pic a donor vehicle/engine with swp style p/s and use those brackets/pullies
another thing i notice is that you have a '65-68 driver side ram horn exhaust manifold in which used a totally different, and stamped steel lower alternator bracket, i dont have a pic of one but you could still use a more common 69-72 iron lower bracket regardless
and your upper bracket is not a 65-68 one its more like a 69-72 truck one but not quite because it is bent- unlike the truck ones.
the 65-68 truck ones were longer and bolted to the front of the intake manifold and were always painted orange red.
must be from a car, as i do not recognize it.
i only know my trucks, so...
hope that helps.