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The sohc and dohc block are physically the same. The difference is in the pistons. Stock sohc pistons are flat, while stock dohc pistons are domed for a bump in compression.
The stock dohc head flows more air than the sohc, which is the obvious choice in the "bang 4 buck" department. What is your build plan?
Stock vs stock, the actual HP difference isn't much from the SOHC engine vs the DOHC engine. The DOHC head (engine) has more modding capability though.