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I was thinking the same thing too. These cars were built with single springs and people ran the hell out of them. Its possible that the heads wouldn't need additional machining, but he wasn't sure until he got into it. If that were the case, the dual springs are only about $70 more... but that is still money that could be spent elsewhere on the car if dual springs won't gain me anything.

and that isn't counting the machine work that will have to be done to the heads to make a dual spring work. If you don't need them don't use them. Use a single spring rated for the cam if possible.