I plumbed up the AN lines for the clutch master cylinder yesterday and it fits but has less than 1/8" clearance using a 90 degree AN fitting on top of the master cylinder. My concern is that pushing the clutch pedal will come with some flex in the firewall and if so, that force will be applied to this fitting hitting the bottom of the hydroboost unit.
I don't have much room to adjust it down significantly but can weld the holes up and move it down a little more if the consensus is that this will eventually cause a failure in the fitting. I zoomed in close and you can see where I zip tied a small piece of rubber hose on top of the fitting to keep it from contacting the hydro boost unit directly.
My other option is to go with the rubber hose that came on the unit since the cap had a built in 90 degree barb that was low enough it did not come close to the hydroboost unit. The reservoir came with a 3 AN fitting and all my other lines under the hood are AN so I really don't want to go with a rubber hose and clamps but I also don't want to NOT do it the right way to begin with.
Here are a few pics, with some zoomed in.