What Gearbox???????

Can anyone help!
I have just fitted a complete engine and gearbox to my car, but we cannot get 5th and reverse gears to engage.
I have beeen told that it is not a Nova Gearbox , so i am trying to find out what Gearbox it may be, anybody got any Ideas?

that'll be the gear linkage needing adjustment. f20s into novas are notoriously hard to sort i had probs with 1st reverse, takes lots of time and patience adjusting it.

Cheers mate!