few 351w heads are worth it, the 69 windsor 4 barrel heads are nice because they have bigger valves and a tight combustion chamber and flow pretty well, but you will need to have hardened vavle seats installed and usually they need new guides and all the normal machine work done to be reasy to use, in the end you have 7-900$ invested in them, you are better to buy a set of new allum heads, ebay has edelbeock knock off heads for 6-900$ per set and they are great for performance, i have used them before.
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