how can i beef up my 318 performance

I have a performer 318/360 intake port matched to the heads. Carb is a thermoquad. Cam is 210° duration @ .050 and .450 lift. New timing chain is a must! Even if you keep the original cam. The original nylon tooth timing gears are junk. I have a stock electronic distributor and orange box. I am running stock exhaust manifolds and dual 2 inch exhaust. I don't have any time slips for that Dart but it is way faster than a stock 318.