I didn't re-read these but I'm pretty sure I covered the basics in at least one of them:
http://www.toyota-supra.info/forums/mkiii-supra/20429-karman-vortex-air-flow-meter-supra-turbo-lexus-compatibility-not-upgrade.html?highlight=maf-t
http://www.toyota-supra.info/forums/mkiii-faq/19847-maft-pro-or-something-newer-better-now.html?highlight=maf-t
http://www.toyota-supra.info/forums/mkiii-supra/15330-mass-air-flow-alternative.html?highlight=maf-t
The MAF-T is NOT a tuning device... That's why you have the SAFC. The MAF-T is only intended to allow you to convert to a GM MAF sensor with is available in larger sizes and thus offers less restriction (plus they're MUCH cheaper to replace, easier to find and just as reliable as your old KVAFM).
A NEW, STOCK fuel pressure regulator will be fine. The concern comes from running an old unit which isn't going to hold up to the extra flow. I haven't had a problem running stock FPRs and upgraded pumps. A healthy FPD is also needed.