^^^ That's what fun looks like, with massive points for coolness.
If I understand the OP correctly, the goal is to have fun & go quickly enough to pick off an import/newer car or two.
I can tell you that the most fun I've had in my '97 Mustang is track days.
Compared to the fast cars, it doesn't have enough power, brakes, gear, or rigidity, but passing the racier-looking cars is priceless.
Wheels & tires, springs, shifter, strut brace is about it for mods. It's obvious to me just that adding stiffness and brakes would be huge improvements.
(Bear in mind my frame of reference is Vintage TransAm, specifically a '71 ex-Penske Javelin, a privateer '69 Mustang, and an ex-Shelby '67 Mustang.)
Mopars don't have as much road-course history as GM & Ford, wasn't Chrysler's primary focus.
I say find a light Mopar, follow the advice of those here who track theirs, and enjoy Life.
There will always be a quicker guy with a bigger wallet; focus on what you can do.