Most likely, you will not have an adequate brace under the dash unless you install one. I believe you could build one easily enough by bending some tubing (one to two inch diameter) to closely match the shape of the inside of the cowl. Weld a flange on each end so that it can be bolted to the floor/frame rails. You can then mount your pedals and have something substantial to mount your steering column to as well.
Dennis W. Parks
Author of automotive how-to books