engine cutting out down track after in 3rd gear!

Sounds like you are running out of fuel. Also after you adjusted the timing did you re adjust your carb? Your timing was way off so a carb adjustment is in order. You are idling at 1400rpm as well. That seems about 300 RPM too high. Carb needs some tweaking AFTER you get the timing situated.

I put a timing light on mine just about every time I take it out. It only takes a few minutes to make sure it is right.

1) Get your Timining situation & fixed
2) Adjust your Carb correctly
3) In that order only or you will chase your tail forever.