Lozzer, I had my local tame (and highly trusted) garage fit the new bar - it was very important that a full 4 wheel geometry was executed afterwards because we had also fitted AC springs, 2 new front shocks and an AC steering rack. Over the years I have found that the 3200GT benefits from very precise full 4 wheel geometric alignment. The ARB's not quite the same size as the old one in that the attachments on the end for the drop links are welded on rather simply forged flattened (welded is probably better). This means that while the critical location dimensions are spot on, the additional "chunkiness" of the end mounts made them a bit of a squeeze to insert through the gaps in the linkage around the wishbone - they had to compress the spring in situ (by weighting the inner wing) just to get the wishbone to move enough to provide enough clearance. The flanges for the bushes (the alloy ones from Cornering Force) were absolutely fine in location terms.
In terms of driving, the biggest difference was an increase in grip at the rear which is something that any 3200GT seriously needs. When I researched this seemingly curious effect, it turns out that a stiffer front ARB really will increase the grip on the other axle .