I thought dual quads had coil running front to back?
Also watch hanging stuf from your hood.
Friend had a strap catch his fan and slammed the hood down over his back till it stalled the engine.
You can put your hand over the carb to creat a choke might help in starting.
I feel like your timing is way off.
You might be sparking between the coil and valve cover?
Turn the lights off and crank.
Key in run does not provide full battery voltage to coil during cranking, you could jumper from battery plus to coil plus while cranking with remote remote starter. Disconnect when not cranking.
Realistically you could run on only one carb.