I found a set of GT40 iron heads for sale. The guy that's selling them said the intake side is ported to a felpro 1250 gasket and the exhaust side has light porting. He wants $450 for them. Is this a good deal? Also, these heads use pedestal rockers correct? I want to put together a mild combo for my vert. I have a cobra intake and a 65 mm TB so far. I'm thinking about using an E303, Trick Flow stage 1, or possibly a custom cam. Would I better off with these heads or should I get a pair of thumpers?