Making a 3-Season Driver

So I’ve been slowly working on getting my car to the point I want it. It’s a 1970 Dart Custom sedan with a 225 and a 904.

So far I want to use it from April to November and switch to a different car that will get winter use.

Ideas on the table are:
• Hardened valve seats - Done ✅
• Electronic Ignition - Done ✅
• TTI slant six exhaust
• Kelsey Hayes Disc Brakes - Done ✅
• Torsion Bar Upgrade
• Sway Bar
• XHD Leaf Springs - Done ✅
• KYB Shocks - Done ✅

I want to keep the drivetrain original, carbureted, with the TorqueFlite. I also want to keep the torsion bars and leaf springs, but I’m wondering what other things I can do to give this car the best chance to keep up with modern traffic.