The valve cutouts in the pistons are in different locations sohc vs dohc. You may have problems in changing the heads because of valve to piston clearance. Also, the DOHC heads have more volume (cc's) in the head and your compression ratio will decrease if you don't change pistons too. You will need to use a Dohc intake and exhaust manifold. You may also have to change the computer because of the different torque curve produced by the Dohc setup. You could also consider installing a Sohc Magnum Head, that also comes with some expert level mods that you will need to do. Trade you neon for one with a Dohc in it, if you want a Dohc so bad.