i wouldnt have them ported and potentially ruined locally. either have them Pro ported by a Reputable LSx head porting shop like TEA, Lloyd Elliot, or Livernois or have them just cleaned up and checked. valve seats, guides, seals, springs should all be done or checked prior to just bolting them on. and 220 shipped is a deal for esentially 243 LS6 heads!!! minus the sodium valves of course! haha
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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