definitely go with the 670, I'd probably look at hedman elites for headers, and for a cam, I'd look at these 2 lunati cams, I'd choose the smaller one

http://www.lunatipower.com/Product.aspx?id=1578&gid=287

http://www.lunatipower.com/Product.aspx?id=1579&gid=287

comp #911 springs should work with either cam

http://www.summitracing.com/parts/cca-911-16/overview/

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