If you invest in the right rods, pistons, turbo, manifolds, intercooler, valves, cam, head work and fuel delivery you could make 320hp with less than 88kg and under 8K aud.

There is a non-nissan way and a nissan way.

The non-Nissan way is a using a cheap suzuki g13 block and using a 61mm stroke g10b 4 cylinder crank, 78mm sleeved bores and bore posts or bore brace tacked welded on.
g16b 16v head with sodium filled exhaust valves and one single inlet and exhaust valve enlarged opposite each other and biased porting to suit a polyquad head layout. Custom inlet and exhaust manifolds with the right turbo should see a powerband in the 4-10k rpm with around 400hp. There is more involved (eg nissan e15et rods and forged pistons) but this is a hayabusa alternative with a supra gearbox or 1.6 swift gearbox and lsd depending on layout required. Engine with all ancillaries should be around 80kg complete.

The Nissan alternative would be more challenging to be around 88kg but you could try to see if you can get a long rod a15/14 with 76mm bore fit an a12 forged crank and E15 crossflow head conversion to try and reach 400hp.