Here is how I raise mine when I need to get it high enough to work under. I'm not recommending this to anyone, and if you try this at home it is at your own risk. /disclaimer off

Equipment needed:
2 - rolling floor jacks - The 3-ton jacks at Harbor Freight are what I use. They are well made for the money, and I've used one for over 15 years without any problems or leaks.
4 - short jack stands - Short is the key here. These cars are so low that my normal jackstands are too tall. I bought the small aluminum jackstands from Harbor Freight for the back and they work perfect for this. Again, they seem to be very well made for the money, and these cars aren't that heavy that mega-stands are required IMHO.
2 - rubber wheel chocks

First, I place the chocks around one of the front wheels.

Then, I place one rolling floor jack with a small block of wood on the cradle under the rear differential to raise the back end high enough to place two small aluminum jackstands under the rear jack pads. I know that the differential is not a recommended jacking point, but it looks pretty solid to me and so far I've had no problems doing this on any of my vehicles.

Next, I use one rolling floor jack on each side under the front jack pads to raise the front end. I place a small block of wood on top of each jack's crade to prevent any damage to the pad area, and then slowly raise each side an inch or two, alternating sides.

When the front of the car is high enough to crawl under, I slide two more jackstands under the front suspension. I place them under the lower A-arms near the spring. There is a pocket there where my shortest steel jackstands fit nicely. I then lower the rolling floor jacks slightly to put weight on the front jackstands, but leave both floor jacks in place just as a precaution and backup. This way I have the car suspended at 6 points.

To lower the car I just reverse the procedure. The Crossfire frame is very stiff, and the car will try to lift off the rear jackstands as I lift the front. I just go slowly and alternate lifting of each side to minimize this.