you know,if your dead set on that camshaft, you should just save your pennies and get a nice set AFR's or Trick flow heads. you can get 10.5:1-11.0:1 compression with aluminum and also they flow enough to support that type of camshaft. your combo right now, is totally out of whack. a camshaft is as only as good as the heads are. if aluminum heads is out of your price range, then use your iron heads and put a camshaft under 230 duration @.050 and go from there,and if i were you i would use every bit of information from us, because it will increase your chances of having successful engine. good luck on your build!