A friend and I are looking to build up his stock numbers match 71 383 in his four-speed Road Runner. He's hoping for a relatively mild build with over 400 horsepower. It was rebuilt the stock specs about 10 years ago .Was thinking of taking some weight off the engine by using 440 Source Stealth heads, aluminum water pump and housing., TTI header's. It's an air grabber car and he is wondering what intake utilize the factory air grabber. So is anyone have any ideas for intake manifold and camshaft ideas?. And how are those heads Will work on a 383?? Thanks