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From what I can find they ran a two barrel injector. So most likely the same injector from the 1988-on 350 pickup motors til they started multi port FI.

They look a lot like that. Injectors over butterfly valves. http://carburetor-manual.com/rochester-throttle-body-fuel-injection-repair-manual-ebook-p-409.html

The 427 truck motor shared the same block design if I remember correctly. Both had gear driven cams. And I seem to remember intakes and cranks interchanging. The 427 was quite common in school buses around here.