Here's the deal: grippier tires will increase lateral G/speed in corners, but also impart increased loads to the suspension & chassis.
Having the articulating bits firmly located allows those loads to be consistently applied, as in predictable/repeatable handling.
How far the OP wants to take this will dictate the extent of improvement, of course.
But I can offer an example from back in my vintage T/A days:
We restored a privateer Mustang, which had retained a fair amount of rubber bushings.
We also restored the ex-Penske/RWR #1 Javelin, which didn't.
Same race tires, wheels, similar weights and such.
The Mustang was a bit of a pig by comparison, not as predictable/repeatable as the Javelin.
This is correct. Look at race cars, they have lots of structure picking up the suspension mounting points for a reason. One doesn't add all that weight to a racecar without a purpose.
Starting simple, tires, eliminating the isolation and shocks are the easiest and highest bang for the buck. Don't forget a solid alignment, meaning not a chain store job.
After that, assess how much farther you want to go.
One could do far worse than looking at say the Big Oly Charger or other vintage NASCAR Mopar.
