Cars are faster these days, but when you get down to brass tacks, it really doesn't matter anyway.
I guess it's all relative to where you live. A car with nothing wrong with it will always be faster than a car that needs a headgasket, or has inaccessible engine components without removing half of the other components, to me. LOL
Nevertheless, I do want to put an LS motor in my Caprice. There is a kit available to adapt a T56 into any Caprice, Impala SS, Roadmaster, or Fleetwood Brougham, and a 5.3 liter makes over 400HP bone stock out of the junkyard with only a cam put in it.
The undercarriage has it's limitations but they're still a blast when set up right, there is no substitution when you need a cruising car so it's fun when they handle well too.
I think I'm just pissed when I see all the brain donors putting huge wheels and lift kits on them, negating the purpose of the car. Wheels over 20", maybe even 18", have no place in performance and do nothing but increase rolling resistance/wear out brakes! I feel it's my purpose to make any car I drive a big FU to those people.