I'm new to the motorcycle world and will be going to write my test for my M1 tomorrow

Anyways I was pricing out bikes and a neighbour of mine has a1980s (can't remember the year but looks like a 1981) Honda CB750 custom for $1 500.00 with new battery and safety done. It looks in great condition but already has 54 000 K (yes from Canada) on it. It is chain driven and its road ready. I was wondering if that is a fair price and if there is anything else I should look out for.
Another question I have is the fact I'm a 6'4" male weighing around 200lbs I'm very sure 750ccs will be able to get me out of the way when needed but is it too much for a beginner?
I look forward to hearing the input. Thank you