BJ7 gearbox rebuild

["Pieter and Linda Scheenhouwer" <pieterscheen@optusnet.com.au>]

I am overhauling a BJ7 gearbox for a friend. I know it is a BJ7 box as it
has the loose needle rollers in the main shaft but it has had steel syncro
rings as per a BJ8 fitted. They are in perfect condition, so my question is,
can I leave them in or do they need to be replaced with brass. The car is
being built as a rally replica and will probably see some competition work.

Cheers

Pieter

Australia