Your first sentence is a bit confusing "with crankshaft at TDC, but no. 1 cylinder does not fire properly." Are you saying that you are getting spark on the other cylinders just not No. 1, or do you have no spark at all? Or are you getting spark, but not at the right time? And when you say "crankshaft at TDC," assuming that you are referring to the piston position in cylinder no. 1, which direction are the cam lobes for that cylinder pointing? And what direction is the distributor rotor pointing?