Ah... another mini-me...
First off I am hosting my write up for a high compression mini-me
here. You obviously don't need everything in there, but everything you need is there, if you get me.
Are you saying your car is an auto, or the one the motor is coming from is?
I consider the OBD1 conversion necessary, as the RPM switch or ghetto-rigged VTEC switches are not the safe or right way to run the motor. It's really not hard, I can make you an OBD0-1 conversion harness for less than RyWire if you want (that's a standing offer to anyone, /shameless plug). The only rewiring you need to do is the ECU conversion harness, the distributor conversion harness, and the 2.5 wires for VTEC. I also recommend using at the minimum a 4-wire O2 sensor, but preferably a wideband like the Innovate LC-1.
Realistically, the mini-me is (or at least can be) the cheapest/easiest swap, and can be a nice little motor. On the other hand if you don't do it right it's going to be a pain in the ass that's hardly faster than your Si. It's cheap enough that there's no need to skimp on things for it.
Let me know if you want any more help, I have one, jmart just finished one, ollie has one on boost, and I'm sure there are plenty of others on here with them that are willing to help out.