Don’t know to much about this but when I was looking at reducing temperature in the engine bay wrapping was an option and ceramic coating was another , + and - corrosion with wrapping, cost with coating but looks good .my situation was different to yours my 3.9 V8 was running hot so I fitted a Mulfab radiator and all is well I also had a TVR chimera 4.5 V8 ,much bigger bonnet and engine bay so I just stuck the number plate on the bonnet as it was covering half the intake and that worked a treat so maybe looking at getting more airflow is an avenue? I’d be interested in your solution if you find one
