Suspension/Chassis Suggestions - 70 Dart Swinger

Having done quite a few cars the thing I crave the most and want now is a nice unmolested stock 6 cyl dart like yours and I would Leave it as is. Simple, stylish, and rare! Almost all of them have been hot rodded ip and big blocked this and road coursed that etc….. it would be cool and nice to have a stocker! That’s my vote
I'm keeping mine a 6, but am so glad I stiffened up the car just a skoash (both in general and in roll rate with the sway bar), as well as upgraded the front brakes to factory disc. stock, my .85" t-bars had a wheel rate of 100 lb/in, the new .92" ones are rated at 150. the rear 5 leaf springs were rated at 85 lb/in, the new 6 leaf 130 lb/in....