Since we have this discussion...
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Nissan blazed this trail when they put a rb into a z31 body over 20 years ago.
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No. They did not use any USDM parts to fit the 200zr's rb20det into the Z31 chassis.
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Now if you only have 1/2 inch between the firewall and the head, then the flange of your tranny as installed is indeed back further than in the stock implemention of the Z31's VG30.
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See, I think you are getting a little confused. I have a rb25 in my car, mounted to the exact same transmission mount that it came with from the factory, and the engine mounts at the crossmember are at the exact same location fore/aft as the factory. Making it the same exact location as the factory vg30e. Now in relation to the rb mounting places, the vg mounts are in fact further back in than on the rb, bringing the vg closer to the front of the vehicle. Is that also what you are trying to say?
So as you can see the factory mounting postions have been utilized. With that being said, mounting the RB using the factory mounting positions of the VG, it will give you 1/2" clearance between the RB head and the firewall. There is no need to move the engine further back into the engine bay.
A factory turbo crossmember can be utilized, but we are both in agreement. It will be more difficult and require more fabrication. Here is a pic of the NA crossmember next to a Turbo crossmember.
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but arguing with someone who's been professionally working on Z31s as a Z car specialist starting at Z shop of miami in 1988 will always be an uphill battle rarely, if ever, won.
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Well, then we are pretty much equal. I have been working on the z31 chassis since 87. I agree, you have knowledge and I respect that. Which shop did/do you work at? Your screen name looks familiar, But I cannot place a name with your screen name.