The offset on those GN hubs is quite large, it will be difficult to get a good scrub radius unless you are willing to do like I do and run a lot of offset, which then limits your wheel choices to custom made 3 piece wheels that are then not sell-able or compatible with anything else. YOu could just be happy with 2"+ SR but then that also means shorter arms, and longer arms are generally better to maintain a more stable RC/IC. And you're gonna wish you had lower SR trying to steer those 335's around IMO.
I can't remember the numbers, but I think the normal C5/C6 wheel offset is 55mm, or about 2", and my offsets are 3" with the GN pin pushed all the way as close to the BJ as I can get it. A couple years ago I could have rattled all these numbers off the op of my head, but I think the distance from the pin shoulder to the wheel mounting surface is almost 4" ? Of course you don't have to run a rotor hat anymore which saves you 1/4 of SR
Personally I think that pin would be massive overkill because the aluminum C5/C6 upright is going to flex so much. Building a custom setup from anything else is more difficult though because the pins are harder to find. YOu might try looking at the Impala pin that the stock car houses also sell. Or if you identify a hub you like Coleman can custom build a pin for you.But you better understand your offsets and SR before you dump $600 into that project.