Engine Hard Starting After Days Of Rest

One way to troubleshoot the problem is to let it sit for a few days then remove the air cleaner and give it a shot or two of gas down the carb if it starts or tries to start then you know that the gas in the carb is evaporating. I had the same problem with my 318 Barracuda, I installed an inline fuel pump and it helped. Had to turn on the fuel pump a few minutes before trying to start to get the fuel into the carb.