Budnicks! Can you please confirm for the car that handled like it was on rails - what size and brand wheels and tires were you running? If the tires were 15 inch I am surprised! I have upgraded everything on my car except have new .092" torsion bars with my current small block and only have stock rubber bushing struts and with my 15" radials it handles very well, but not like it's on rails. I'm interested in hearing more...
- - - Updated - - -
The car was a 68 RR RM23 HT with all the parts previously mentioned & either BFG Radial TA's or BFG G-Force Comp TA's, the Comp TA's didn't last too long 235/60/15 & 275/50/15, but were far superior to the regular street radials, but the street radials worked very well for what the car is/was, same sizes I mentioned above/before P245/60/15 front & P295/50/15 rear, if you were to put it on a skid pad, I'm not sure what it would have done, maybe .85 G's guessing, but I'm positive it would be twice as good as OEM stock rubber bushings, stock A-Arm, stock sway bar front only, stock steering, stock 14" stuff... I guess what you think is "handles like it on rails"...LOL... It's not a ZO6 or Lambo if that's your point, but compared to the stock, body lean, front end push, rear drift & under-steer characteristics of the original suspension, even with decent 15" or 17" radial tires, in comparison it handled like it was on rails, compared the the crappy stock OEM parts & handling {for my purposes anyway}... I'm sure it would have done even better on 17"or 18"'s & super sticky tires, but I don't like the rough ride of the rubber-band tires {let alone wear & cost}, especially here where we have some rough roads, that will "bend the hell out of, a large diameter rim" & rubber-band no side wall tires.... Your car sounds like it still have far more OEM parts than I had on my old car or even have on my current car... On the old car the, Sub Frame Connectors, the MP tubular adjustable upper C/A's, adj. Dynamic Strut rods, Edelbrock Gas Shocks & Unisteer Rack & Pinion, made a world of differences {I will be using them on this car too}, let alone adding a larger 1-3/8" frt. & 1" rear sway bars, even with the orig. 0.90" Torsion bars, the car can be lower, with better center of gravity & is not compromising the alignment or ride quality, you can lay back the caster angle, to were it will track at higher speeds & handle much better, than with the OEM even with the Poly-graphite bushing {that help considerably over stock OEM rubber bushings, if you use the proper style LCA pins when installing them}, if you go with the 2" Magnumforce drop spindles, it could be even much better, with an even better Lower Center of Gravity... Good luck have fun that's what it's all about
for a set of radials (245 60-14's) that i had in storage, which I believe are on a 6" magnum 500 rim. 
