I have a 100% tested and working 87 Monte Carlo SS #1228079 computer which includes both the factory OEM Prom chipset and a ZZ4 prom chipset.
This was used in my 1987 Monte SS 350ci SBC Vortec motor build. Car ran extremely smooth and fast with a Lunati cam, Cliff's High Performance Rochester E4ME carb, headers and ZZ4 chip.
I sold the car 2 years with the stock 305 motor, carb and ecm put back in it and just discovered that I have this and a spare ECM & 1987 CCC engine wiring loom that is uncut.
I'm asking $100 shipped for the ECM and both the ZZ4 and stock eprom.
I'm asking $75.00 for the CCC engine wiring loom that is uncut. Finding these OEM CCC engine wiring looms uncut is rare these days.
Would do a package deal of $150.00 for both the CCC engine wiring loom and #1228079 computer which includes both the factory OEM Prom chipset and a ZZ4 prom chipset.
PM here if interested.