I agree with Mattax on all points except maybe the front tire size.
With SS springs,and 1.03 bars, and a sway bar, I recommend as big tire and as tall a tire, that you can successfully fit up front and on an aluminum wheel. That 215/70R14s mentioned probably comes in at about 25.8 which is a good height for the SS springs.
But if you are not racing then I would recommend to fit 235/60-14s on 7.5s with a zero or very close to zero, offset; then lowering the rear with blocks made for that, to level the car. That should give you a little ohchit room, if you come into the turn just a little too hot.. These 235s are about 25.1 tall, so .35 lower ride height. Resist the urge to put those 235s on 7" rims, the tires will just roll over onto the sidewalls, and lift the inside tread, and then you might as well have just installed the 215s.
The measuring rim for a 235 tire is 6.5. That just means that the 235 is a 235 on a 6.5 rim. That does not mean that the 235 should be installed on a 6.5. You can install it on any reasonably close rim you choose, but it will no longer be a 235..... cuz the 235 is a section measurement.
The correct rim size for any tire depends on it's usage. In straight-line cruising, that 6.5 wheel might be just fine. But when you stuff it into a corner it all goes to heck. An 8.5 might be great in a corner, but you might not be able to get the beads installed. And it is hard to fit even an 8" rim on an A-body at zero offset. So by default, that just leaves the 7.5s.On a 7.5 the section width will grow just over an inch, so now it becomes a 260. and since the height has not changed, it is now a 54 series tire. In conclusion then, the 235/60-14 on a 6.5 rim, has become a 260/54-14 on a 7.5 rim. The magic of the new system. But hey, it gets better, tires are sized to the nearest 5mm, so depending on the tire-pressure, that 260 could be rated at 265/ or 255/ and of course the profile would change again,lol....... crazystuff
