nice find!
keeping it stock will cost you a grip, since series 1 parts are ridiculous expensive compare to series 2. i also have a 70 and i dont plan on leaving it stock at all. it's going to put on fender flares, lower it, rb-r, and turbo motor. like rtubor-930 said, keeping it stock does not apply here on hbz. my best advice would be, do what makes you happy. not others.