I can try and borrow/measure roosie's pressure plate, if he has one yet as he was having problems getting the one he wanted, and do a measure, I'll post it up if I can.
I used the R380 box, or LT77, can't remember now when I did a V8 4L in a 3 door, kept it hydraulic clutch though using sherpa V8 and mgbgt cylinders.
tabetha