Personally, it all comes down to Power-to-Weight Many of these new cars with driver are in the 4400# area and with say 750 HP they are right at 5.86# per H.P. There are many variables, but with current technology of 8-10 speed transmissions and traction control, they make this power range seem like not enough. My Coupe with me is 2100# and my engine is realistically in the 350-380 HP area which puts me at 5.52# - 6.00# area.... which in these 'Senior Days' of life is quite sufficient for a thrill from 0-100 mph which only takes a few seconds. This same car when I built it the first time 30 years ago was powered by a 388 SBC that made 541 on the dyno and it ran high 9's in the 1/4 on street tires then and it was a riot to drive all over the place. Hot Rods have Power, you decide on what is enough.