What are the timing specs on a 390 big block that was in a 63 T-Bird?

The 390 big block engine in a 1963 Ford Thunderbird typically has a factory timing specification of around 6-8 degrees BTDC (Before Top Dead Center) at idle. The recommended total timing, which includes both initial timing and mechanical advance, generally ranges from 30 to 36 degrees BTDC at higher RPMs. It's essential to consider that these specs can vary slightly based on the specific configuration and any modifications made to the engine. Always consult the vehicle's service manual for the most accurate settings.