When you say manifold, I assume you mean for carbies, right?
If so, I may be able to help of no one else will.
What type do you want, long runner that used rubber tube mounted balance tube or short runner that uses a cast alloy balance tube?
Pacemaker make extractors for 18RG into RA23/RA28.
There are a couple of other companies that do too, but we've had trouble with them cracking a lot.
Pace makers may be to goer there.
As for the electronic coil, get one from a 21RC or a 22RE, I reckon those will do the trick as they are used to convert 18R dizzies to electronic all the time.
I think that a newer (than the celicas) model mitsubishi magna uses a similar coil that can be sourced from repco.