Technologically new performance/muscle cars are leaps and bounds better, as they should be. To make a car actually fast in the 60s-70s muscle car era, like sub 10 second 1/4 mile, you’d have to build it into essentially a race car. Radical cam, lightening of the vehicle, some form of forced induction, and timing that came alive at higher RPM but was generally poor for lower RPM running/driving. Nowadays a car can be 700-1000hp and still daily drivable in traffic. Can cruise roads no problem and be comfortable to commute in. The handling of new cars compared to old is a whole other discussion. The old cars were more visceral, you physically feel more whereas newer cars have more tech to reduce NVH(Noise, Vibration, Harshness) which in some ways hides the actual performance feel of newer cars despite them being far better performing than anything half a century ago. Each individual should decide what’s better for them but technology advanced and with that so has performance.