welcome.....don't know if you've looked at these guys before, but....
http://huxracingusa.com/huxweb.htm
they do my tuning and they rebuilt my buddies mr2. They strictly deal with nothing but MR2's, but will work on almost anything Japanese. Eric and Emily are the owner's, great people....
I know you're wanting to do the SC upgrade to the 1mz or 3mz. Not sure how much experience they have with the SC for those engines (besides dealing with mine) since they mostly deal with turbo'ing those mr2's, but Eric's knowledge is endless. If you ever run into a speed bump...hit him up, he's very personable.