Brake Vacuum Pump Help

if it has a 408 motor it should already have disk brakes and good working disk brakes take very little effort to stop, no need for power brakes, remember power brakes will not make your car stop any faster than manual brakes, (if it is a leg strength problem due to injury illness or age then a power buster will help IF you have already converted to disk brakes and IF you are using the correct master cylinder)