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Vortec's would be alot better in the long run over the 305 heads.
You can find them at junkyards,sure,but in order to put a cam over .450 lift you have to grind down the back of the exhaust valve seat and machine them for bigger diameter z28-style valve springs. I had these on my 87 IROC...bought from a cylinder head company off of ebay already hopped up with the big springs on there up to .550 lift. I paid a little less than $1500 shipped to my door ready to bolt on.
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79 Z28 - Cam only big block,Turbo 400,TCI 3500,12 bolt,4.11's,spool,etc etc
2000 Xtreme DD- hammered on 18's,cowl hood,body colored door handles/mirrors,20% tint
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