Big Block Abody with factory front suspension

All Formula S Barracudas handled well. I've had 3 for decades, most daily drivers at some point. My Original 383 Fastback is no slouch. I run high performance radials, same size, all around with Bilstein shocks. The suspensions are stock and have been gone through, no tricks. The 383 car has the original 15/16 front sway bar and torsion bars with 6 leaf rear original leaf springs. Yes, it rides rough. They are not Drag cars. They are not trailered road race cars. But they handle well enough to keep up with most street cars, in the curves or straights. The radial fronts and bias rear tires are the kiss of death. Fix that first. A lot of good advice above.