318 with a 340 4 bl intake

I have a 70 Dart 318 and I did this. Pulled the 2bbl and was amazed to find the heads were gasket matched, dropped a 68 340 intake on it with a 600 cfm carb, 1971 340 manifolds with 2 1/4 duals, also installed MP electronic ignition, really woke the engine up, runs great!