Thanks for suggestions guys. I'm going to leave the CT20b where it is for now.
I've got a Power FC (thanks for the referral chase_d), and a Profec B boost controller, to go in so I'll see where those get me.
Next is some cosmetic stuff, BC V1 coilovers and some better spark plug leads. I was looking at some 8.5mm Magnecor leads and will probably get them unless someone can recommend something better/more suitable?
MR2QIK; no thread. Car is basically stock save for an exhaust, some slotted brake discs and better pads, so a thread would be a boring read. :)