I see you’ve abandoned your filthy Matelot ways and rolled the tilt correctlyMy series 2a has a 200tdi.
For the upgrade to work properly and not eat parts of the drive train, you ideally need beefier diffs from a Range Rover, overdrive, and freewheeling hubs.
With regards to sound proofing I’ve lined the engine side of the bulkhead, gearbox tunnel and under the bonnet with stick on soundproofing dynamat type stuff.
The UJ door cards are actually door mats made out of quite thick carpet. They also help to deaden rattles and vibrations.
It’s still loud but definitely makes it a bit more bearable.
View attachment 477142