Quite often, working on a vintage or late-model Mustang is fun. A large part of that is due to an intriguing upgrade, such as installing a four-barrel carburetor and intake in place of a two-barrel.

Dribbling water and wet carpet make for grouchy Mustang owners. Heater core replacement is enough to make you groan, especially in the post-1966 cars with air conditioning. Even with proper ...