I have a nearly complete 3 rail box here. Missing the input shaft and a syncro rings but has a lot of stuff you need.
I also have alloy bellhousings for the twin cam in stock if you want to go that way. Just remember that Twin Cam used a bigger clutch slave cylinder to regular cars so the mount boss will need to be milled out.
As Bloodyeck said, they are all pretty much stock Ford parts from 1500 Cortina so ask for that when you buy. TC seems to oput the $$ up.
stephen
0413 389 332