That's was what I was going to say. Street legal and a race car with plates are very different.
There are always protests when it come to street car super star events etc which is unfortunate as I love street legal drag cars that are stupid quick.
I do know of a Torana that runs low 8s that will prob turn up and is 100% legal and registered from sydney No idea what forum it will represent though
How tight is the engine? Any track days planned?
I ran Castrol 10w-60 synth in my R33, but was a fresh engine that saw a lot of revs
I am a big fan of penrite oil's atm so it the motor is reasonably tight either the HPR10 or HPR15
For gearbox and diff have a look here
http://www.skylinesaustralia.com/forums/topic/35442-faq-general-maintenance/
and here
http://www.skylinesaustralia.com/forums/topic/631-gearbox-oil-change/
and here
http://www.skylinesaustralia.com/forums/topic/11443-diff-gearbox-oilhelp/
Same model Integra as the other ones?
Also, have you done any cages and/or suspension work to 70 Series Supra's?
If not, I have a nice cutaway drawing of a works group A version I would like replicated next year sometime