Dimi, I am not up to speed with your Aussie state rules etc, but it seems a bit double sided when the Corvette brakes ( 84>> C4 ) were IIRC, developed & supplied by PBR in Aust ( Also fitted on some commodores as well- that may be an avenue you could look into ) . Also it amuses me ( you probably wont be ) that they dont also spec that the donor & recipient cars need to have similar front/rear weight distribution- tyre size etc , rather than HP/OA weight similarity.
You might have to shift to NZ, mate- we have rules too, but they are a lot more user friendly.
On the replica of the Ford GT- I would have to ask -why- take a hint from Clarkson/Top Gear, only time he did anything right, sent the thing back!
Jac Mac