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Both the SOHC ZC and DOHC ZC for the corresponding years are a direct replacement. The SOHC ZC is essentially the same deal as the D16A6 with a slightly more agressive cam profile with the DOHC ZC being closely related to the D16A1/8/9. Having said that, they swap in without major modification. The only thing you really have to worry about is converting your DPFI to MPFI if your car isn't originally an Si model. If it is, you can literally swap in either verison and go, even using the PM6 ECU that is already in your car. If not, aside from converting to MPFI you need to switch the ECU to run the four injectors. The 1st gen ECU from an integra (PG7) will work as will the 89-91 Si ECU (PM6) as well as the ECU meant for the ZC (PM7). There is specific close ratio transmission meant for the ZC but any transmission from the EF body style will work. As for upgrades, I hear people tend to state that there aren't many upgrades available specific for the ZC engine which in a way is true and not true. If you have the DOHC version (which is what I have) it's true that you won't find many specific parts to upgrade meant for the ZC, but it doesn't necessarily mean you can't upgrade it like any other motor. But you definitely have to know what is interchangeable and what is not. For example, the intake manifold is interchangeable with the 1st gen integra motor but not with the Si. What does that mean? You can use the Jackson supercharger meant for the 1st gen integra if your heart desires to go forced induction via a supercharger. But the exhaust manifold is interchangeable with any d-series counterpart (Note: Exhaust ports are the same size and shape as a 92-95 Z6 head but vertically off by 3mm). What does that mean? That you can use a Greddy turbo kit meant for the D16Z6 if you want a bolt on turbo kit. But since the kit is meant for a 92-95 civic, the charge pipes have to modified because they are meant to manuever around the engine bay of an EG and not an EF. Pistons have the same bore as an Si, alternator is interchangeable with 1st gen integra as is are the camshafts, cam gears are interchangeable with B-series, timing belt is interchangeable with an 88 prelude, etc. You just really gotta research your parts.
For me personally, I wouldn't change my ZC out unless there was a good enough reason. It is a good all around performer and can be modified just the same as any other motor. But as I stated, you can't just order a part for a DOHC ZC engine, especially since it was never offered as an option in the US. What it really comes down if you can't decide if this motor is for you is to ask yourself what your goal is with your car.
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