I have a 1983 SeaDrive that I installed an overhauled block on. I swapped all my electric and ignition that was on the working motor that ran last fall. Due to a cylinder head failure I ended with water in one cylinder and it rusted frozen last winter. The block assembly was identical as I had used it a number of years before. I checking spark I have no spark on one side. Looking for any ideas. I do have 2 extra power packs that I can try.