VERY hard to start after the car sits for a day or more.

Folks…

Those would be good answers you're giving him if he'd just bought this as his first-ever carbureted car and didn't know correct starting procedures.

The way I read his post, that's not the case. It reads to me like it was starting easily from cold, and now suddenly it's not. Which means it's a lot more likely that something broke or failed, and a lot less likely that he suddenly forgot how to start his car.