I can get these heads D00E for $150 they have been exhaust ported and a new valve job .They still have the rail type rockers on them . Are they still worth the investment with wanting a taller lift cam . Placing in screw in studs has to be expensive I bet and have never been or inquired of this procedure .

As I have read the GT40P heads only require some better made headers and already have the hardened seats . They also have the same valve and flow better .