There are many threads on this on IRV2.com. In summary, you can put on a steering stabilizer for about $600, I just added a degree of forward caster when I had the front end aligned. Commonly done , cheap, and solved the problem.
I believe the next biggest improvement you can do is to put a rear track bar on it. Also about $600. It will stop the tendency of the rear axle to shift slightly side to side and stop the "tail wagging the dog" syndrome the Ford F-53 chassis has. I put it on myself and very strongly recommend this upgrade.