New here, will be looking for advice!!!

Hi guys (gals too), wanted to say hi & give a heads up that I will be needing some advice on a 1969 2 door valiant (bone stock original 39K with auto & 170 /6) regarding increasing performance a bit. I don't want to hack it up as it's too nice, but am thinking about more HP (Hyper Pak setup?, Etc. rather than an engine swap?) and swaping in an 8 3/4" sure grip rear and disc brakes from a low mile 1970 4 door Valiant I have (are the '69 & '70 parts directly interchangible?), also should it acquire a 4 speed? (although I sort of hate to do anything that cant be undone fairly easily). I'll need to find an appropriate Mopar "expert" to do most changes I decide on, can deliver the car wherever for work. I do mostly detail/cosmetic work myself. Car will be for street, not strip, casual performance use. Beyond new heavy duty rear springs & a set of wider powder coated rims from a Formula S with appropriate tires, I'm not sure or set on where to go with my plans.

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