As someone who has competitively RACED these cars, I can tell you the torsion bar suspension is SUPERIOR to ANY of the coil over kits from a handling standpoint. I find it hilarious guys spend thousands of dollars on a coil over kit to gain header clearance, when they could have just bought a good set of headers
Personal opinions aside I thought handling and safety upgrades were good,there have been so many improvements like brakes,chassis stiffening,injection etc that simply didn't exist when the cars were built.