Hi Steve.
There seems to be limited choice for off the shelf suspension mods for capri in Australia. Not surprising since early capris are not mainstream stuff here. Much easier to own falcon/Holden but who wants to aye?

Having said that a company like king springs can set you up with lowish coils and leafs. The main choices for shocks are monroe gas for low cost standard type, to gaz or koni for fast road. The latter two are adjustable so can be set up to suit your favourite driving area. Apart from this, good quality bushes thruout and some kind of front end adjustment like noltec strut tops should get it all working well.
Me? Well all Ive done so far is put good quality bushes thruout, a 24mm anti sway bar(which also has a castor adjusting capability) and monroe inserts with standard strut tops. I want to get the car thru roadworthy and registered before changing too much.