The only weakness would be the smaller 359 engine the 89 has. On hills and if you try unloading on the go you will run out of power. Some have early engine failures to because the engine is over taxed. But if your in no hurry and it has no been abused it should be fine.
I've seen where the bolt comes loose, this guy put several dampeners on but it just beat out the keyway and ruined the end of the crank. Put in new crankshaft with different design. Had a longer stronger bolt in the end of the crank to hold on the pulley.