From a past post, and out of my "Viper files":
The middle of the front cross member (the meeting point in the "K" of the frame) will allow you to pick up the front of the car.
Placing a floor jack under the "S" part of the rear side frame rail (closest to the center of the car as you can get) will pick up the back of the car - although one side will come up first, the chassis is stiff enough to pick up the back end.
We pick up the back end first to give enough clearance to get to the front. This is the only way we ever jack the car to get it up on jackstands.
Jack the back end of car at the start / curvy part of the frame's "S" curve FORWARD of the rear axle. This will pick up your jacking side of the rear first, but keep going and it will pick up entire back end.
Place jack stands under FRAME RAILS behind S curve - not too far out. We only lift the car about 16 inches or so - just enough to be comfortable to work under there. We have never had an issue about the car moving in this tilted position, but again, we don't lift it to a 45-degree angle.
Jack up front of car - either by placing jack between front and rear wheels and going in that way, or, with a low enough profile jack, going in from the front. Place jack saddle at the intersection of the "K" crossmember. This will pick up the front of the car very evenly.
Place level jackstands under FRAME RAILS slightly behind where the tie down holes are but not directly underneath the "A" arm reinforcement. Again - big thing here is to make sure you are under the thick / wide section of the frame and not the front 1/2 height section of frame horn.
HTH
