I helped a guy on Renntech do just this. You can use the cable throttle body but you want one from a 3.4, the 2.5 one is too small. Then just treat the motor like a 3.4, use the 3.4 program in the 5.2.2 DME etc. No you can't use the later 3.2. As mentioned by Blue-S, the later PWM adjustment on the variocam is not compatible with the earlier DME without custom programming.
-Todd
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Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
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