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The only way you can "convert" a SOHC to a DOHC engine is swapping out the SOHC for the DOHC. Like said in the first reply, SOHC stands for single overhead cam. DOHC stands for dual overhead cam.
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Uhh.... d16z6 bottom end with a zc head there you go i just converted a 1.6 L SOHC to a 1.6 DOHC.
It's called a "HEAD SWAP" not that difficult.
no you can't put a "B" series head on a "D" series block but that's what the letters are for to denote compatability...
so since honda made a "D" series DOHC motor (d16zc d15b1 (not sure on that one but there was a non-vtec dohc 1.5 l in an early integra) so you could use that head as well.
You can do it but the power differences your noting are between the D16y8 SOHC VTEC motor in the EX and the b16a2 DOHC VTEC motor in the SI.
these are two totally different motors. One is a "D" series motor the other is a "B" series motor.
the D16zc that i mentioned earlier puts out similar numbers to the si engine but it is a "D" series block and head so you could use that. the swap's are much less common and hence not well documented your best bet if you really want DOHC is to do a motor swap.