It'll be fine! I ride a '69 trail 90 as my work vehicle. I'm 6'1, 270#. It hauls me around at 45mph and get 90 MPG all day. I've put over 4000 miles on it since I bought it.I'm looking at a 1971 Honda CB350 for my first bike purchase. It would be perfect for me to ride around town. My fear is that it is too small for me.
I'm 6'6" 36 inseam and 270 lbs.
I'm just a big guy but I love vintage bikes.