Sweet car dude.
I really dig these cars. (Seem to be too few of them around nowdays)
I dunno about using an SR computer, but I do know a guy who fitted full managemnt from a CA18det to a Z18et. The car went to invercargill, then the motor got sold to a guy who lives around the corner from me.
They adapted the CAS to the dizzy, and then just used the CA18 TPS, AFM, coil packs ignitor loom and computer to run it. This gives the advantage of computer controlled timing. With the stock ecu and dizzy, he had been getting pinging issues once the boost got up over 12psi. I don't know if it ever wound up getting powertuned. (He lived in Dunners, and my other mate with the nostune tool is here in CHCH)
One thing that did have to be done though was the CAS had to be dismantled, and the disc inside it needed to be inverted. This is because the dizzy turns in the opposite direction to the camshaft. It did run fine before it was iverted, it's just that it ran on two cylinders.