Hi again mate
Like I said in my first post you need to slow down a bit and take stock of what you have, there is no right and wrong spec as such but many different things you can do to get your car running again, you will require deep pockets if you start changing too many things right now, can I ask again who is working on the car for you, do they understand single Supras, if not the first thing I would do is get it to a specialist, we can suggest several in London/Essex etc
I am in Purfleet in Essex if you want to come over for a chat and discuss a few options, I am not mechanic but have owned a few singles in my time, I would be more than happy to talk your option through, there are several guys on here who would make some very wise choices with regards to where you should go with the spec etc
This should come out of MKIV Tech I would have thought and go to Chat ?