65 Barracuda - Idle and no start issues

Thanks for all the input so far! I installed a brand new battery when I purchased the car, but have not checked how much juice is left after the no start. Condition of alternator is unknown and there is no functioning ammeter present so I suppose that could be it, although I still had functioning headlights/interior when she wouldn't crank.

I've had the car up to temp multiple times at idle before hitting the road for the first time, adjusted the idle mixture screws down to the lowest smooth idle. The carb has a manual choke, so besides the idle mixture screws is there any other adjustment on the carb that would affect idle? If this is a vapor lock issue what would be the easiest way to combat that? Fuel filter with orifice and run a return line to the tank?

I will begin by checking the battery and grounds, then mimic conditions to see if the problem(s) occur again.