It’s in an 85 Buick LeSabre. Currently has 198,000 miles. Runs smooth, though 2 vacuum lines are missing. I plugged them with a bolt until I locate their destinations. Does anyone know what mileage these engines last and any tips to keeping them smooth? I know they tend to run hot, and the Quadrajet Carb allows for some performance. Also I’ve noticed every gasket on this engine likes to leak. I’ve replaced all but the head gaskets. Any clues on what a rebuild kit costs for this car as well?