Pancake
DRAC - Digital Ratio Adapter Controller
http://614streets.com/drac.html Not required if you are using aftermarket inline 2000ppm VSS.
KS - Knock Sensor (
http://www.sae.org/technical/papers/9004 88 )
Air diverter valve - A.I.R. used to control if AIR pump output is diverted into exhaust manifold or bypassed out
http://www.freepatentsonline.com/3940928.html
ESC - Electronic Spark Control sends a voltage signal to the ECU. As the knock sensor detects engine knock, the voltage from the ESC module to the ECU drops, and this signals the ECU to retard ignition timing. The ECU will then retard the timing when knock is detected.
EGRV - EGR CONTROL SOLENOID
TBI adapter plate = it's OK, but be aware of possible leaks. For a clean installation on pre-87 heads I use Holley 300-49 Intake manifold (if you have funds).
Used factory harness from a pick your part JY is about $30-40, aftermarket new harness $300+. Factory harness is 20 years old - make sure that wires and connectors are in good shape. I have done couple of these conversions and have a collection of PED weatherpack connectors (Look for a connector kit on EBAY)
OEM GM sensors can outlast the car, but I I would not pay top dollar for them. Cheap is the word when it comes to used.
Gas tanks - you'll have to do a bit of research, but look for a tank of EFI burban (30 gal) that mounts behind axle. EFI tanks have baffles. You'll need 3 port fuel sending unit (and possibly in tank fuel pump, which is better than external)
For best drivability keep all sensors - unless you want to learn how re-program ECM on daily bases. Sensors: O2, MAP, TPS, CTS, and VSS. For off road you can omit AIR. Having CCP costs very little and prevents tank fume build up!
TBIchips can get you a chip - if you get ASDU code ECM it should work close enough to get you going.
//RF