Gene, My blades are level with the deck, however when I mow tall grass I'll lift the front of mower and the grass gets cut many times. My blades left hand discharge on the belly mower, L306. My blades are 4 3/4 inches lower than the deck, so I made my shroud 5 3/4 inches. Can't ask for a better mower. Wish I had done this years ago.
On my Jubilee, the rear mount 6 ft woods mower, is a right hand discharge. On this mower, the wheel height can be adjusted with spacers. I have the front wheels 1.5 inches higher thant the rear wheels. If the grass gets away from me, I'll lift the front even higher. The rear mower is set up for 540 pto speed which is close to 1500 RPM's engine speed. The Jubilee can easily crank over 1800 rpm's and the blades are singing in the wind. I normally keep the PTO close to 540.