Decided to get stuck into making the new gearbox mount today as there was a chance I'd need to move the E21 off the pit; but the gearbox was supported on a trolley jack in the position I wanted it to be mounted.
I measured, drilled and then installed the mount on the gearbox by removing the factory harmonic absorber (pictured below, normally this is just two heavy pieces of metal hung from the gearbox by a bracket and seperated from the box with two rubber pieces), then drilling out both that and the 50x25RHS together and located a bolt that fits (from the rear control arms of a Falcon)
I then welded the ends of the mount into the transmission tunnel/floor pan of the car. These bolts are designed to be hit in and out with a hammer (hence the taper and lack of exposed thread on the end) so it should be easy to remoove them and the rear rubber from the gearbox when it comes time to remove the engine or box. The bracket the harmonic absorber hangs from is also removable if required.
Clearance for the steering tube is now fine as pictured above, and below shows the general clearance of the sump to steering rack.
Finally, one last shot looking down the transmission tunnel. Installed like this, the trans sits much higher and I believe I will be able to install the centre bearing assembly with the factory nuts/bolts instead of the spacers I needed previously.
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