Mike, this will be a nostalgia build, i.e. as it was when first built - a 186 with triple webers.
I agree....a 186 with triple DCOEs.....or LC XU1 spec with triple Zenith/Strombergs.
What a great project Peter! The Mk 7 is arguably as good looking as the Nagari.
If you're going with the correct engine, why not take the easier route and use the correct gearbox?