I would be wary about the ramp rates being 270s, maybe a little more spring pre-load you could get away with them
But with 270s you would want to rev a 25 pretty hard to take advantage of them, or is it for your 30?
More lift + more duration = less gas velocity at low revs
So even if the actual RPM that max boost is reached is lower, the car will have less power off boost
Revs are instant because it is geared ridiculously short....so much so that its top speed is only 230-240km/h
As a guess I would say ~2:20 due to sitting on the limiter for most of conrod
The Gibson Car had a best of 2:12
Mark Berry's R34 did a 2:13 with big aero and 700+hp and a hollinger
Where abouts in Canberra are you?
I doubt you will need a hand though, I can do all 4 in a bit over an hour by myself, it really is easy as pie.
3 bolts per shock and thats it, back seat has to come out though