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The Vibratec ones are too harsh on a road car imo. Only needed for ITB'd/RS2'd/TC'd applications. Brand new OEM mounts and a powerflex dogbone should do the trick.
The lowest part sticking out of the sump is only the electrical contact. If you use a proper sensor (VDO) it has a predetermined breaking point to prevent the sensor itself from getting ripped out.
The Burpspeed guys did this iirc. Shortened the rod running from the lever to the box to make the gearstick lean a bit more backwards. Don't know how far you can go with the interior still fitted.
If you tie the pre cat sensor away, the car will run like a bag of whatever. Pre cat -> used for engine management ; post cat -> used to check the catalytic converter efficiency.
Why didn't you weld the pre cat lambda boss to the "downpipe"? Oxygen sensor will now only read the emissions from one cylindre, signal might fluctuate a bit too much!?