So long as there's somewhere you can stand upright, even under a hatch
, you might be okay at a pinch. I'm 6 foot but so many vessels provide for 5'10" headroom and you can never forget it.
I've lowered the sole for headroom on a couple and put a hatch
in another. Very few boats years ago had headroom, with 4'6" being the standard - the view was that you went below and sat.
These days, few are prepared to put up with the inconveniences of yore. It's salutory to recall
that, not too long ago, it was said that more people had circumnavigated in a Herreshoff H-28 than any other single
design. And while it's a beautiful hull
, life below was rudimentary.
So unless the boat is super cheap
and perfect in every other way, my advice is to keep looking. Because you know what they say: act in haste and you can repent at your leisure.