I would put another lower mileage engine in and drive. Fix yours as you have time. Good running engines are still plentiful and that might mean another 10 years without a rebuild.

__________________
85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.