I cannot comment on the ‘MISSION’ but can comment on the addition of turbos. Before you start the process of turbocharging, there are few things you need to check since your engine is old. Mechanical health (like cylinder compression, unusual noises), leaks, and other issues like smoke from exhaust or clogged pcv. Once you turbocharge your vehicle then the rest depends on the turbo capacity, and air and fuel mixture tuning that determines how much HP/torque, at what RPM, and fuel efficiency. You can gain fuel economy if you have low boost at low RPMs and high boost for high power demands at high RPM. You would also need a reliable tuner to get things right according to your personal needs.