could it be the timing at this point? OP mentions rotor lined up at TDC. Was distributor moved around? Maybe try a timing light on # 1 while cranking, see if you can set timing.
Crank whille jumping, or use a charger with a boost.
I'm thinking it may be more in the wiring, maybe check the bulkhead connector. A lot of juice goes through it for the amp meter. Also check all the other under hood wiring for loose connections, and corrosion.
Don't forget to check the bliker fluid!