the last 3 of those conversion have all been performed by TTracing in brisbane. the rb25dett is (as far as is known) australia's fastest silvia, the vg30 is owned by the owner of TTracing but was only completed the night before jamboree so i'm still waiting to hear about it's power and times. his son owns an rb26dett silvia but i haven't heard much about that.
the 13b turbo silvia is also in queensland and is almost finished i think. i have heard of the 1jz and 2jz being done but i haven't seen them and can't exactly remember where.
rb25dett silvia
vg30det silvia