I need to change the valve stems seals in my 360 Magnum motor and need guidance. The engine is installed and want to know proper procedure to remove the old ones and install new ones.

My car 74 Duster mild 360/904/3.91 13.44/101.54 Son's car 75 Dart Sport 318/904/4.10 looking for a 360 or 408 2004 Dodge Ram 1500 Laramie 5.7 2010 Dodge Challenger R/T Classic B-5 6 speed 2010 Jeep SRT8 for the little wife