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It's fair to say that the difference between 20 and 25 engines will be very small. An inch of block height is not a lot of mass compared to the rest of the car, even if most of it is right over the front axle. You could estimate the extra weight if you needed to.

For the gearbox options....because the box is so much closer to the middle of the car, it probably will have little effect on the front/rear distribution also, even though the 25 box is nearly double the weight of the 20 box.

I know this doesn't really help!

R32 SEDAN with RB25 & R33 box. 1450kg total with driver and almost empty tank.

Only things that would effect weight from standard coupe are 17" gtr wheels, gtr bonnet, gtr rear hubs.

870kg front (959lb./wheel sprung)

580kg rear (639lb./wheel sprung)

There's a weight bridge in oakleigh that will do it for you for $20

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