A ported Gt40 lower matches the Upper manifold, but I was wondering if there was a less expensive route then getting the upper gt40 intake manifold. Could I bolt on a stock upper intake manifold? I know that it is really the lower intake manifold that is restrictiing air from the stock manifold anyway.... Any other less expensive ideas? I have the lower gt40, but don't have an upper intake manifold. I Also have afr 165 heads. Any suggestions? Thanks