its possible. you're going to have to basically build it just like any other engine. it would be pretty cool to see a single cam beat sr's. put them in their place. do the usual stuff, forged internals, and either find a turbo kit that will work, or fab your own stuff to cut some cost. once you get it all together, up the boost and see what you got. 10 pounds on a dohc will get you some 300 hp. shouldn't be too far off or the sohc.
good luck with the build