Replacement Springs and Bars

Once you have the torsion bars in you can adjust the front height and subsequent rake pretty easily by backing out the adjustment bolts to lower it, or crank them in to raise it.
I replaced my 0.81s with 1.0s and have a 340 small block in mine, and it was just trial and error with the bolts to get it where I wanted it.
I also went with the HD rear springs and they didn't pop up the back end that much at all.