TE510 fork oil question

After replacing fork seals and purging as much oil as possible by stroking the damper rod until nothing else comes out, I'm confused on exactly how much more oil goes back in there. What i'm interpreting from the Marzocchi 50 manual is that the chamber needs to be full (no air) and the oil level in the slider is set at 320ml. Is this correct? I've been watching videos for hours and everyone does it different or "just sticks their tool in and sucks it out until it sets the oil level". No help if I don't have that tool, now is it? Some just pour the 320ml in there and close up the fork, leaving it full of air. So which is it? Air purged or not? If I fill the cartridge and purge all air, then put in 320ml, the fork is almost full and I need more than a quart of oil to do both forks. Doesn't seem right to me.

Open Cartridge forks- TE's 50mm
>you pump the damper rod- just to "bleed" the circuit-
>oil level- measure without spring, and with outer tube compressed so its flush with the inner/lower tube. Measure oil level. Tube is vertical and level while measuring- acceptable is 110-130mm (airspace) based on preference. I use 125 mm. (notice I measure height (mm) rather than volume (ml).
YOU definitely want air at the top of the leg when as described above (that's your air spring). If you filled it to the top- it wouldn't compress. (make sence?)

I use a farm animal feeding syringe (3 pack for 2$) with a length of vent hose- to measure and draw excess. (no special tool)

Thanks. Husky's IKEA-style manual is confusing as hell. That makes much more sense.