Stock sbc location, stock 1978 GM accessory brackets, & long water-pump.
I should not have tossed the old parts w/o looking for a possible p/n on the clutch. The fan was just a 5-blade unit so I wanted to upgrade to one w/7-blades & the clutch had play. I assumed it was just an OE fan clutch so I scrapped both parts into the metal bin @ my work. According to others that have done the swap from the Chevy 2pc (1pc upper; 1pc lower) plastic shroud to the Olds 1pc plastic shroud w/the metal top plate they align the same. My original shroud was busted up & tossed in the trash when I started cleaning up things underhood so I can't compare them either.