What is the timing for a ford mercury 1964 390?

The timing specification for a 1964 Ford Mercury with a 390 engine is typically set at 6 to 8 degrees BTDC (before top dead center) at idle. It's important to ensure that the timing is set with the vacuum advance disconnected and the engine at operating temperature. Additionally, the total timing should be checked at higher RPMs to ensure it falls within the manufacturer's recommended range. Always refer to the specific service manual for your vehicle for the most accurate details.