Great to see a restoration underway !!! Looking forward to seeing the progress.
strange but true, I have an extra new 5th gear synchro if thats your issue (only 5th), I can find and PM the part number if needed, also have spare gearbox seals (toyota) again happy to sell for less than toyota or elsewhere as i ordered too many parts on my gearbox rebuild.
Lots of "upgrades" for reliability and power, many at low cost, enjoy the journey rebuilding and discovering mr2 :)