66 Valiant - stranded on road trip

Hi All,

I'm on a tour of Vancouver Island and everything was going great in the 66 Valiant until my key went dead after a stop (i did smell burning briefly before). Having been through it once before i check the connections. No lights... so my A1 power wasnt getting through. I checked the back of the ammeter and had 12v on one side (black) and 5-6v on the red. I attempted to bypass the ammeter and upon this something smoked in the engine compartment. I disconnected the jump and went to look. The Fuseable Link looked like it got hit. It crumbled in my hand. So...

I cut the connections off the back of the ammeter, ran a new A1 line from the starter post with a 12 Gauge 20A fuse at the post (is this enough?), directly through the bulkhead (no connector). I then spliced it with the R6A from the ammeter. The car starts, headlights... but it runs like its mis-firing.

Have i fried something else? any ideas? I have to get home tomorrow... thought i was clever and conquered it... apparently not.

Thanks in advance