My guess is it is the same hose as an L78, as the Holley carb has the same connection point and the PCV is in pretty close to the same location, so the 3871298 looks correct:
http://www.gmpartswiki.com/getpage?pageid=102361
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70Z28 04B Norwood Forest Green-white Stripes Black DeLuxe Interior
Owned since 1978 - First Car
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