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RE: what
Depends on how much power you want. The factory cylinder head is somewhat of a determining factor. You can build a nice little engine around the factory head, but it's the biggest hurdle if you plan to make a fire breathing monster out of it. Without a power adder(nitrous or forced induction), the key to wringing all the power out of the 258 is to reverse all of the compromises they made at the factory in an attempt to keep it emissions compliant. The exhaust sucks. The carb and intake manifold sucks. The ignition curve sucks. The camshaft sucks. The cylinder head sucks. The compression ratio is depressing. The......can I stop now?
What do you expect from this engine? How much power do you want?
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