If you are satisfied with the way it shoots leave it alone. But a lining job to make a new chamber and bore are very doable. However if you can get a barrel for $200 it's a better option because I doubt you could get it relined for that same amount.
1 other note of interest:
It's not hard to make 30 Remington out of 30-30 Winchester if you have a lathe. When the 6.8SPC first came out I made about 100 cases from 30-30, and it has the same head dimensions as a 30 Remington. The easy way to do it is to turn off the rim of the 30-30s and grind a tool to cut the case groove. I made a spud that went into the case neck to give it support and would simply chuck up on the neck to spin the case agains a live center in the primer pocket. It's an easy and quick way to convert the rimmed case into the rimless one.
