Thanks Dunk. Hope you're well.
This is true. After further investigation I am swaying more towards the valve stem seals over the turbos so I'll get them ordered up from Mr T next week.
Regarding how to take the car forward, it's an ongoing dilemma that, no matter how much I ponder on it, I can't make my mind up. I've always wanted a 6sp Single Supra. Part of me thinks I should, possibly, sell it to someone who would want to keep it as it is and buy another Supra which is already single/6sp, saving money I would have to spend on mine... and also not butchering a decent UK car. If I did the later, I know I would kick myself years down the line, but you can't have it all, I guess.