SAFC II on a 4ag 20 valve (silver top)

[Ivan141]

If you need to be sure, get yourself a wideband O2 sensor first.. you cant tune the engine with an SAFC or whatever else you put on it decently without one anyway.
When you have the sensor you´ll be able to see where more fuel is needed easily.

For the rest I think an SAFC might be a simple way to tweak the injection a bit if you´ve already got the 20v ecu anyway. I doubt it will need dramatic changes in fueling.