[BBC71Nova]

You are correct but this really isn't so much about adding additional height adjustment. At least with the 3rd gen Novas it appears from my install that the G-link w/Fab9 will go as low as possible before you'd be required to cut up the tunnel and trunk floor. See my build thread for pictures.

This "me too" activity is - or at least should be - simply about the special cases where someone has installed a G-link along with the Fab9. This setup - all from Chassisworks - puts the diff filler cap in contact with the shock crossmember shortly before the shocks bottom out at full compression. I'm planning on dorking around with my pinion angle some this weekend as well to see what that changes.

I don't think this would be an issue with a 12 bolt setup or most other setups without filler caps up high on the diff. I am not able to confirm this but I also don't think this would be an issue for anyone running the leaf pad mounts instead of the weld-on lower shock mounts. In the pictures I've seen it looks like those don't go as low. Therefore, the shock compression would happen sooner.

It is frustrating and if a "bolt in" replacement crossmember is offered then I'd be interested. However, at the point you've committed to going so far with a build as swapping a car to a completely different suspension design this level of modification/make it fit/fab work should basically be expected. You'd still be way ahead when compared to the work to install similar products.