They are the '70 cast and the ones to get. I'm having a pair done in the machine shop right now. You'll need hardened seats for unleaded fuel. Probably new springs and valves. I got new seals in my rebuild kit. Many people have screw-in studs put in. The exhaust is usually ported out and polish intake and exhaust ports.
Get an estimate from your machine shop. You can probably buy a set for what it will cost you to get them redone. Like you I already had them lying around, but I'm going to save about $100 at most.
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79 Indy Pace Car with 302
(rebuilding motor)
82 LX 4-banger
91 Turbo Probe
98 4X4 F-150
99 Sable 24V DOHC
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