Are you going to drop the engine and box then un bolt when under the car and split ?
I’ve done a few clutches on the A2 both diesel and petrol and I’ve always left the engine in place but removed the front slam panel and rads to gain good access. But I’m working on a a garage floor with only trolley jack and axle stands. I.e. no car lift
Make sure you clean up a 'really' good bit of the exhaust for the earth. Don't use either the car body or the engine to earth on. Get the earth as close to the weld site as possible. These measures will help prevent damage to the electronics on the car. One of the exhaust hangers might be a good place to get your earth clamp onto. If you can't, use Mole / Vice Grips (cleaned up), and then put your earth on those.