First I went for the heat gun and scraper. This softened it all and got the big chunks off.
Then I went for a paint stripper (decap) that made it into a gloomy sludge.
I then used baby wipes to wipe all this sludge off.
Then I went for the wire wheel on my drill which polished off the rest (and covering me in tar)
It was dirty but there was not much to do, only the rear of the engine bay. The rest of the engine bay I wire wheeled and I will give it a slight sanding before apply an antirust primer and then a couple of coats of top coat.
I can then start rebuilding the front end and engine 😀