Ford NAA that just won't start. Ran great last year, put the battery back in this spring and for a while it would only fire if the starter cranked. Now it doesn't fire at all. What I've done: new plugs correctly gapped, new carburetor, new sediment bowl, checked the intake manifold for obstructions, reground valves and reset valve clearances, check for strong spark in all four cylinders (it has an electronic ignition), checked timing best I can (no marks on flywheel - only dabs of paint), checked compression (60-80 which is what it was when it ran great), replaced the coil and relay. Any theories or ideas for what I might try next?