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I'd use the #6 heads over the #8 ANY DAY (64cc vs. 79cc). From what I've heard, the #6 heads are rare. Valve sizes are 1.995/1.624 unless they're from a W31, in which case the intakes are an even 2.000 - I think. Unless the owner is asking a ridiculous price or if they're cracked/damaged, jump on 'em! They'd do your late 70s 350 (assuming your #8 heads are on their original motor) a world of good.
- GoldOlds
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