thats a bit of a sticky one, dont think many people have gone about it the same way as you. not many people have turboed a non turbo 93 as they are so easily available as turbo in dohc form. at a guess you could even use a dohc bottom end and the sohc head if needed, but obviously the dohc is better, i know quite a few drag engines have them removed as they can provide un even temps accross the piston. although they are put there factory for a reason.
all depends on what you are doing it for? just for fun, a cheap project or doing it properly?