There is a lip on the cowl brace just under the curved fiberglass cowl top. The round tube protruding down is for the defroster hose to attach.
In the lip you should find a few holes (manual says 3), one centered and 2 approx equal distant to either side.
Here is the top lip on the dash. You can see how it is "folded" back to slip between the metal lip and the fiberglass cowl.
If you have the full dash that goes to the trans hump, there should be a couple more screws attached to the "L" brackets mounted to the hump.
I have an extra bracket mounted across the lower back of the dash which you see (bright silver) to hold the electronics for the electric door poppers. I installed push buttons on the front of the dash and I have a remote key fob to pop the doors and the trunk.