327/300 w/ Rochester Carb Stalling When Hot

I just picked up my '68 w 327/300 and automatic transmission. It starts up fine and will stay running for about 5 miles through the city. But when it's all warmed up, it stalls. Then it will start up but stall if I put it in gear. Have to let it cool down and then it'll stay running. What should I check? The car has been sitting a while so not sure if the timing is off or not.

What is the correct timing for a 327/300 with automatic?

Thanks,
Steve