The only parts you are likely to need (assuming the piston/rings/cylinder are O.K.) are very easy to come by. The Tillotson carburetor is a little bit special but Bill Robinson in Fayetteville likely has everything you would need, bearings and seals are stock items at most any bearing supply house, even the clutch drum/sprockets are all over the place when you realize they interchange with 30 years worth of production saws.
The bar looks to be in good shape, and there are lots of vintage bars still around. the only thing that makes the bar a little bit different is the adjuster, there is a milled scallop in the bar for the adjuster to engage, lots of the vintage bars will have have two or three different adjuster options built in.
Mark