There are many different ways you can go. A Performer RPM intake with a TBI adapter plate can make a good intake combination. The above mentioned "Ultimate TBI Mods" give some good ideas on helping with intake air flow.
http://www.thirdgen.org/ultimatetbi You can Google it as well for even more ideas and info.
I'd think a camshaft kit like a Lunati 10120701K kit would go well towards increasing power. You need to confirm the heads and piston clearance would be good for that lift.
2 big things required to use Vortec heads are the self-aligning rockers and the Vortec specific intake.
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