Where do you set the timing marks on a 1970 Plymouth Road Runner?

To set the timing marks on a 1970 Plymouth Road Runner, you need to locate the timing tab on the engine, typically on the front cover. Align the timing mark on the harmonic balancer with the appropriate degree mark on the timing tab, usually around 5-10 degrees BTDC (before top dead center) for optimal ignition timing. It's advisable to use a timing light for accurate adjustments while the engine is running. Always refer to the specific service manual for precise timing specifications based on your engine type.