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Another thing to consider, in addition to those ideas already mentioned, is the primary resistance in the coil. This is assuming that you have retained the original 6 volt system. The coils sold by most suppliers are incorrect for this application having a primary resistance of 3.5-4.0 ohms instead of the correct 1.5 ohms. I had a very similar experience when attempting to start my completely rebuilt 8ba v8. The spark was present, but weaker than necessary for ignition. After changing to an Echlin IC-7 coil, which has the 1.5 ohm primary resistance, the engine fired on the first turn of the key. Just a thought.