You might wanna put in a new thermostat while you're at it. The head bolts are supposedly reuseable, but to be on the safe side, I'd go with ARPs. That's what I'm going to use when I install the AFR heads I'm getting this summer. For only $38, you can't go wrong. Oh, be sure to use Loctite's PST (Pipe Thread Sealant) on the bolts that go into the water jacket!!! Good luck.
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Capri306, Moderator, The Mustang Works Online
1979 Mercury Capri, 5.0L -- C4 -- 2.73
1987 Mustang LX Notch 