should i buy this??

If it's not far go look at it. take a comp gage with you. If it's less than 115 offer 4-450 if more start at 5. Depends on how bad he wants to get rid of it and how bad you want it and what it looks like in person. JMHO, your results may and will vary.
 
if a compression checks out around/near 110-120
i'd snag that, i see nerf bars too, + extended swinger and hydro rear brakes
beware of peeps sayin "carb troubles" definately compression check it,
unlkess a routine cylinder bore/piston are in your plans and budget, around $200