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i think the spoiler on the pinto mailny works because it reduces the vortices that come off the C pillars... back in those days a lot of hatchbacks had C pillar angles similar to the pino.
this angle is to steep to maintain attached flow as is pretty obvious, but the airflow comming off the sides will form a large vortex that starts at the top and curves inwards. the spoiler intercepts these vortices and breaks them up.
I've seen this sort of bodie style refered to as a "morel bodie"
it's for this reason a lot of hatchbacks and fastbacks today still maintain a semi "trunk lid"
but todays hatchbacks have mostly a more steep angle; and more boattailing at the rear wich reduces these vortices
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