Its all about common sence.
Building a GT40 aint difficult but it does take effort and common sence.
Ive build my mk2 ground up together with my wife. Took us 1 1/2 year, 3 days a week total devotion.
Covid quality time.
No experiance with kitcars, but 30 years experiance with restoring European...
So while its a beautiful GT40 in every way, in essence its a mk2a with just the snorkels removed and not a mk2B.
I sure do like the twin Holley setup as Holman Moody did with P1047.
Again the detail work is astonishing.
Looks great, I just wonder why is has a decklid vent as it shouldn't be there on a mk2b.
It looks more to a mk2a now with just the snorkels removed as it still has the mk1 front clip and dashboard.
Otherwise way better in detail then my mk2a.
P1047 was as smooth as silk as a mk2B
That not an airlock.
If a temp gauge reads an air lock (=steam) it should read hot and not cold.
There's no need to purge the cooling system. That airlock should be long gone since you have driven many miles even long distance trips for years.
The electrical system needs attention.
Theres a cheaper alternative.
Ford Capri mk1 fog lamps.
FoMoCo part made by Wipac
Can be found at ebay for around £100.
Nearly the same as the Marchal lamps.
With TunerStudio MS (Registered) you even have lots of options including Auto Tune and cold start Auto Tune (WUE Analize) & VE analizer which makes it even more versatile.
Loads of support on the WWW about Megascuirt also.