I have a 71 El Camino with a four speed tranny I'm renovating, and this is my first engine build. Okay, I'm starting out with a with a 350 block and fuelie heads with 64 cc chambers, and the crank is medium journal with 3.48 stroke. I'm replacing the camshaft and lifters, and timing chain. I would like a little lope to my idle, good gas mileage, mid range power, and sound good. What cam should I get to achieve this ?