Not that I am trying to argue but there are 7 sec. imports thats not to far away from a 6 I do think someone will make a 6 sec pass in an import soon.
And there is a 4 sec.Top Fuel dragster with a subaru motor (seen it on ESPN a couple of months ago)
With a million dollars you could make an import run a 6 sec. pass no doubt IMO
Seems to me that you are making the arguement that there is no replacement for displacement. That might of used to been true. On speed vision they had Kenne Bell on there a while back and that dude has a 68 camaro with 4 turbos on it. That motor looked like a big twisted knot of steel tubing.
I think if you took a Nissan Skyline and gave it to liggenfelter or Kenne Bell and said I bet you that you cant make it run 6 sec. in the quarter. Just my guess but I bet that they would prove you wrong.
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88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires.
best 60 ft 2.14, best 1/8th 9.65, best 1/4 15.2 @89mph