If I were in TX, I would sell you the set of C9VE heads I have on my 429 and upgrade to some aluminum heads. I built mine back in 2000...wouldn't build it the same today, as there are too many better options. By the time I installed ARP screw-in studs, hardened seats, guides, valves, keepers, roller rockers, etc, I cringe to even think what I have into them.