I had a 1993 4/4 with Ford 1.6 efi engine.
It came with a steel heatshield bolted onto the exhaust manifold. The air intake was a plastc/flexi pipe about 100mm(ish) that went above it so the intention was to protect that from high manifold heat. I had to replace the air intake pipe as it was deteriorating due to the heat in the area where it passed over the manifold that the shield was letting past.The replacement was a similar material but I wrapped it in reflective heat shield material. A simple job that worked. You could also stick some heat insulation to the bonnet. BUT....removal in a safe way of hot air so it doesn't affect components should be a priority, as is shielding components.
The Plus8 I moved to used to get quite "warm" under the bonnet! No overheating but attempts were made to improve airflow through. Rear bonnet extenders in summer, temporary air scoop/ducts as tests.
There is an option to wrap the manifold or ceramic coat it. There are discussions on the pros/cons elsewhere in TM plus gomog site.

Plus Four MY23 Furka Rouge