Where on the distributor cap does number 1 spark plug wire go a 1991 ford 5.0?

On a 1991 Ford 5.0L (302 cubic inch) engine, the #1 spark plug wire goes to the rotor terminal that is closest to the number 1 cylinder. However, you can't just rely on proximity; the distributor cap itself is marked. Look carefully at the distributor cap – it will have markings indicating the firing order (usually cast into the plastic or stamped on). Find the number "1" on the cap, and that's where the #1 spark plug wire connects. The firing order for a 1991 Ford 5.0L is typically 1-5-4-2-6-3-7-8.