74 Dart Sport Spark Issue

I've been having the exact same issue. Car was stubborn starting one morning, then later that day required a jump (kept trying to fire it up until the battery was dead), but after the jump fired right up. Haven't gotten it started since, jump or no jump. I have power where I need it, have cleaned up all my grounds (need to grab a neg battery cable, it's a little shoddy), and the resistances all check out, just not getting a spark out of the coil. I bought a new coil and threw it on, but it has the same readings as the stock coil and still won't send a spark. I'm going to pickup a new ECU tomorrow, but I'm out of ideas. Haaaaaaaaaalp!

edit: reluctor gap and ballast resistor are both fine, as well.