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Maybe you have better luck if you actually build the inside circuit of the CA3028 in you circuit simulator? Because it includes only 3 transistors and 3 resistors, that is all. What is more, two of the transistors are differential amplifiers and the third one is their current source in their common emitter. See page 1 of this link for the inside circuit schematics of the IC:
**broken link removed**
Maybe another transistor array which include at least two 'identical' transistors could be found more easily in a circuit model form and you could use it as the differential pair section of the inner circuit.
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