1996 Chrysler Concorde Misfire

Engine misfires with no DTC. I replaced plugs, wires, valve cover gasket. Vehicle had flooded cylindars and a blown plug. Compression test would give a false reading due to excess fluid in the cylindars, making the dry compression diagnostic test a wet test. Spark check done on front three cylindars showed no issue, but spark test can only be done at the distributor for the rear three, which I have no adapter to check. My next guess is the timing belt or the camshaft lobes. Any suggestions?