100% you can go with a bigger frame than you normally would. Depends on what your intended use of the bike is. Lots of 80s bikes are pretty small/not too stretched out so you can go bigger to get a more upright position to compensate for riding on dirt drops. I'm 5' 7" and happily ride a 1988 22.5" Hardrock. I have negative ball clearance, but not stretched out.Maybe I need to research the stem options more thoroughly. Could you go with a slightly bigger frame than you’d usually take?