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If the heads are original and rebuilt then they should have hardened exhaust valve seats installed during the rebuild. That's the only reason you can't run unleaded as the lead coated the exhaust valve seats to protect them from the heat. The only way to tell on the seats is to pull a head. Other than that I'd recommend running only 93 octane as with OEM iron heads you'll probably run into a detonation problem running 87/89.
Hopefully you can find some history on the rebuild. Other than that keep your fingers crossed if you buy it.
Dave
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Too many toys?? never!
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