Yup, ZC pistons will take your compression up to 12.0:1 in a Z6 engine, and if you can find the 2 layer Y8 head gasket, your compression will be bumped up to 12.3:1. The "standard" Y8 head gasket is a 3 layer unit though, and the exact same part number as the Z6 gasket... so be careful what you ask for at the dealer counter. Personally, I would just leave out the thin Y8 head gasket and stay with the standard thickness one.
The Y8 manifold can also be swapped on for some more kick. The plenum is huge compared to anything else available to the D block from the factory. Lots of people call the Y8 manifold the "ITR IM of the D series" because of the plenum and runner design.
If you're diligent, you can find the JDM DOHC ZC (PM7) or USDM 88-89 Integra (P29) pistons and rods for about $100 or less (PM7 is the same piston as P29), then add on the Y8 intake manifold for not much more. Later on you can swap in an entire aftermarket cam setup- like a Crower Stage 2 or 3 including valve springs and retainers for $600. ZEX's cam and valvetrain sets are slightly cheaper, and still produce awesome results.
Grab a used VAFC from somewhere, pick up a decent used I/H/E, and you could easily be in the 150-160whp range or higher with some decent tuning. That's not too far off from a bolt on turbo kit that costs you the same (around $1500), and you save weight, stay more "sleeper" under the hood, and have a nice responsive power curve. It's nowhere near as easy to put together as a bolt-on turbo kit, but to me at least- it's more satisfying.