Checked out the heads closer toady. They are '65 289 Hi-Po heads! That means they'll already have the screw-in studs, and I think the valve size will be sufficient. They already have the hardened seats in for the exhuast (but they haven't been ground yet). The intake seats and the guides I can do at school... So, upon sandblasting them, and further inspection, it looks like I'll probably do some port work, the rest of the seats and guides, and throw in some S/S valves, and hopefully some roller rockers.