If you're going to swap engine mechanicals, you can swap just the head and intake (adapting the RENIX TPS to the HO throttle body) and get the same benefit.
If you're going to do a total transplant - electronics and all - I wouldn't bother unless you could get an OBD-II (1996-2001) donor. OBD-I isn't enough of an improvement to bother, I actually consider RENIX to be vastly superior (in terms of flexibility and reliability.)
Simplest overall - if you don't have a full vehicle as a donor - would be to swap the OBD-I top end on to the RENIX block, eliminate the EGR (which is ineffective on RENIX engines anyhow,) adapt the RENIX TPS to the OBD throttle body, and net significant performance improvements because the OBD-I head breathes better.
NB: Monitor your FAR after the swap - you may find you need slighly larger injectors to compensate for the increased airflow. IIRC, RENIX units are rated 19#/hr @ 39psig, you may need to get 20# or 21# units to feed the increased airflow (I want to recall that the RENIX injector duty cycle is relatively high already, and pushing a fuel injector to anything over 90%dc can result in premature failure of the unit.)
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