There are several different spiral wraps. My personal favorite is the simple spiral. Set your rod up like you normally would with the guides all on top. Leave the butt guide in place and switch the rest of the guides 180 degrees to the bottom of the blank like a spinning rod. Next, place your bumper guide (usually a small single foot guide like a size 6) at 90 degrees halfway between the butt guide and the second guide. Your end result is the butt guide at 0, the bumper at 90, and the 2nd guide at 180.
Tape the guides on the blank and mount your reel and do some testing to make sure the line doesn't touch the blank during the transition to the bottom. You'll also want to make sure that your line doesn't stack to one side of your spool so take several practice casts. If it does, offset your butt guide slightly to make sure the line is coming onto the spool from 0 degrees, not 4 or 5 degrees. I think you'll find that your casting distance won't be affected by a spiral wrap.
jeremy