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I'd recommend this cam:
http://store.summitracing.com/partdetail.asp?part=CCA-35-514-8&autoview=sku

Not too expensive, should give great mid-range, and even good power paired with those heads....

I'd definitely look to upgrade the camshaft. With that set of decent flowing heads, I'd probably look for something in the 212-224 range. Will have pretty decent driveability, and any cam within this...