I use a floor jack to get it to the halfway point & set it on jack stands, then use this extension I welded up to raise it the rest of the way.
As top heavy as it seems it might be, it is surprising stable. I turned the pin that fits in the jack on the lathe so there is nearly 0 slop in the fit. Even so, it only gets used on the flat concrete floor & I am careful to stay as clear of the car as possible until the stands are slid in place, just in case. The "Z" only weighs 1,400 lbs. at this point, but we've had my son's 95 Camaro up on the stands to do exhaust work.