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I would go with the Vortecs and ditch the long-runner TPI. Vortecs are insane heads that dont quite get the true respect they deserve yet.... I bought mine for $300 and then put $150 of machine work into them: cleaned, new springs, and screw-in studs. Some people claim you cant go over .480 lift without running into valve guide to retainer clearance issues but mine had like .550" of clearance stock so I didnt get them cut down. Once you have screw-in studs installed you can put guideplates on the heads (no machining required) and run cheap non-self aligning rockers. So, at most you have a $500 head that is probably the best factory GM head ever made.
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