73 duster brake question

I guess maybe I should specify my exact needs... my car as is.. stops just fine.. manual discs with rear drums.. I do have to apply a lot of pressure with my foot to slow it down, I'm a 230lb rugby player, leg strength is no issue at all. I have a bench seat in the car and when I need to push on the brakes the person next to me feels it to. I was thinking power brake booster would take the load off the amount of pressure needed to

Are the existing brakes in good condition? Pads and shoes wearing evenly? I inspect mine once a year. I change my fluid every two years. I let it go for 4 years once, and I could feel an improvement in the pedal feel afterwards. I'm wondering if you have a partly blocked hose somewhere.