I have a friend who had (has since sold the car) a full RRS setup on his 70 fastback - struts, coilovers, rack & pinion steering, big brakes (not RRS I don't recall), etc. By all reports, it was fantastic but not cheap, well over $15k, no expense spared with this setup.
I was considering installing coilovers in my 66, but was advised against it for a street car, so I just installed new control arms, RRS power rack & pinion steering and Bilstein shocks all round. A good quality wheel alignment by an old school guy, and my car now drives beautifully. I am with others here, I wouldn't go coilovers unless you plan to drive it hard, just a good quality stock setup will do the job.