Check out the "FORD CHASSIS" Forum on here, and you will find several great discussions about various ways to improve the ride and handling of the F-53 chassis.
CHF.....Cheap Handling Fix
Front Sway Bar
Rear Sway Bar
Ultra-Trac rear trac bar, also Roadmaster, & other brands
Saf-T-Plus steering stabilizer, also Roadmaster
And even "Liquid-Spring" rear suspension installation. (EXPENSIVE but good)
Hope this helps!