66 coupe came in for front and rear suspension. The rear we ended up doing was the mustang bolt in hiedts 4 link set up. Unfortunately the only pictures we have of the kit is the completed ones since our computer crashed.
There was no need to upgrade to the 9" since the engine is pretty much stock except for a cam and intake and headers. We ended up having to sleeve the 8" to fit it up to the brackets that came with the kit. Which meant the rear end needed to be dis-assembled, brakes, 3rd member and all then put in a jig so the rear wouldn't flex while we were welding to it. The bolt in assembly is great for the do-it-yourselfer but we decided to weld in most of what we installed. Our only other gripe was that the links were without double ended joints so initial adjustment was a pain along with the alignment.
Overall the rear handles very good but could use a rear sway bar.
