it all depends on what you are looking to get out of it.
there isn't alot of support for the SOHC so you are going to be forced to do alot of custom stuff to get those higher numbers out of it.
if you rebuild it and all that good stuff, then it is going to be just as strong as any other engine. on that same token, the SOHC might not make as much power as another engine with the same amount of mods.
Not alot of people have done the SOHC, so you would be different, if thats what you are going for.
Have fun