Headers vs 340 manifolds

ir3333 said

headers on a stock 340 through mufflers aren't going to gain anything noticeable.
3/4 cam was a cam ground specifically for the rpm operating range on 3/4 mile stock car track which would have
no low rpm requirement....or maybe a cam with 12 lobes?

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I'm going to go with the expression '3/4 race cam' coming from teenagers who knew not much about engines. It just means its not a race cam but almost :) Remember back in the day people used to use the term balanced and blueprinted? I had no idea what that meant but it sounded good.