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Intake and water ports are in the same place but bolt holes are not. Vortec uses 8 verticle bolts, non-vortec is 12 angled bolts. No interchange.
This is assuming when you say "vortec heads" you are referring to the 96-up Vortec heads that poeple are now using for performance, not the 86-95 heads off some of the engines with the name "vortec" on the engine covers but aren't true vortec heads.
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