Suspension upgrades for my 65 Dart

Thanks for the replies. I have Kelsey Hayes discs on front with 14” BFG tires, rubber LCA bushings. Mostly my car is used for country driving back roads and a back up daily driver. Looks like my next investment be leaning towards frame connectors, torque boxes and solid sleeve tie rod sleeves.
Honestly, I think your biggest gain would be with rims and tires. at least go 16s or 17s, with some modern rubber compounds.