This is how a bunch of people suggested I mount the injectors:
First problem is having spacers machined up was a pain in the arse, second was how far out the injector sat from the hole in the runner and third was having the injector seal and seat properly. I grabbed a set of pre-fab bushes that use an o-ring around the outside to seat in the standard intake but even the biggest 14mm o-ring was too small to seal in them.
This meant I had to drill out the standard runners to suit the larger body of the new injectors. It has a slight taper on it now and because the injector sits further down in the runner, it now also uses the factory rubber bush from the side feeds for some extra support/sealing.
This is what it looks like now.
While the intake was off, I removed the barbed water fitting at the back (I hate push-on with a passion) and welded on a -6AN fitting for the water feed to the turbo. You can see it at the very back of this photo next to the back of the left rocker cover.
Also mounted the thermo fans correctly and modified the fuel filler door signage... lol.
Tuning it this Thursday.