I have driven both and its just my opinion but I enjoyed the zc better then the z6 engine. It felt like it pulled stronger from the line and yes I drove them back to back.In terms of reliability it seems you have no idea what your really getting and should get your engine from a reliable source. I have heard of some being really ****ty and then there are some that run strong even with boost on stock internals.
As for parts for the zc here is a list. Try this site for more info.


http://hometown.aol.com/nosajuf/nosajuf2.htm


Timing Belt:-----1988 Prelude 2.0-----14400-PK2-004
Timing Belt Cover:
AC Compressor / Parts:-----1989-91 CRX/Civic-----N/A
AC Bracket:-----1988-91 CRX/Civic-----N/A
...The AC Compressor bracket bolts onto the ZC block.
Throttle Body:-----1988-91 CRX/Civic Si-----N/A
ECU:-----1989-91 CRX/Civic Si-----N/A
ECU:-----1986-89 Integra-----N/A
ECU:-----1989-1991 ZC-----N/A
Intake:-----1988-91 CRX/Civic-----N/A
Headers:-----1986-89 Integra-----Any Kind
Headers:-----1988-1991 CRX/Civic-----N/A
Plug Wires:-----1986-89 Integra-----Any Kind
Spark plugs:-----1986-89 Integra----- NGK BCPR6E-11
Distributor Cap:-----88-91 CRX/Civic-----N/A
Distributor Rotor:-----88-91 CRX/Civic-----N/A
Distributor Cap:-----1988 Integra-----30102-PM7-305
Distributor Rotor:-----1988 Integra-----30103-PM5-A05
Head Gasket:-----1988 Prelude-----12251-PM7-003
Intake Gasket:-----1988 Integra-----17105-PG6-S00
Exhaust Gasket:-----1988 Integra-----18110-PG6-003
Water Pump:-----1990 CRX-----19200-P01-004
Oil Filter:-----1988 Integra-----15400-PR3-004
Oil Filter:-----1988-89 Integra-----Fram PH3539A
Oil Pan Gasket:-----1988-91 CRX/Civic-----N/A
Oil Pan Gasket:-----1986-89 Integra-----N/A
ZC Pressure Plate:-----1989 Civic DX-----N/A
ZC Clutch Disk:-----1989 Civic DX-----22200-PM7-J02
Clutch:-----1990 CRX-----N/A