I have a 73 c10 with a 454 and a th400 auto. I put a brand new holly 4bbl on it, a brand new battery and cables, new cap, rotor, plugs and wires. The truck will turn over very slowly at first until it drains the battery. If I jump it, it will turn over fast enough to start otherwise, the battery just gets killed. The alt is working. Could this be a timing problem???