If the owner of this car is serious about taking it back to original racing specifications then a phone call to Beau Seton or Fred Gibson will be a huge help. As long as you inform them that you are serious about a professional restoration and restoring one of Nissans finest then more than likely they will be keen to give you any info needed. Ring them once and write all your questions down beforehand, that way you wont have to continually ring them or bother them.
It surprises me that there is no written history about this Ex Seton car.
If I remember correctly they used to stretch the rules of the time to the limit. A bit like today really!
They used to use the windscreen washer knob as a manual boost controller amoung other things - definately not allowed
One turbo was dedicated to qualifying and thrown away afterwards because it would be rooted because they would run such high boost pressures for qualifying at Bathurst.
Those were the days