I would 2nd CP's recommendations and add that the firmer steering feel and more aggressive alignment specs that he provided is where a lot of the "feel" of a modern car accels over a classic, which has specifications that are built around skinny, hard, bias ply tires. Radials will allow a broader range of adjustment without unusual wear. Total cost for CP's suggested changes; around $575 for the box without exchange and with shipping, $60 for the offset bushings, maybe $300 for install if you don't do it yourself, and $100 for an alignment. That puts you a hair over a grand for the most radical change your car will ever feel. If you step it up to the next stage, $300 for bigger t-bars, $500 for tubular sway bars, and $400 for high end shocks, you will transform your car for around $2500 or about half of what it costs to buy a Shockwave system without the additional headaches of air plumbing and compressors.
Now, if you are one of those guys who like to do multiple things with your car, like cruise, park, autocross, road race, drag race,m etc... than the Shockwave may prove more valuable as you can tune its settings from the drivers seat as you drive or put it into any number of pre-set selections. Don't construe the info above that I am anti Ridetech. They have great products, as do SAlterkation, Hotchkis, Helwig, Firm Feel, et al, but Ridetech is an expensive solution to a problem most owners don't have.