i've always cleaned them out with a pick/bent small screw driver etc. it's plastic/glue that's in there, it shouldn't be that hard to scrape out.    based on this link, it's 3/8 NPT  (national pipe thread i think, plumber might have one) 
this is a different vacuum tree, but it's the same thread. 
https://www.custommustangs.com.au/xd-xe-xf-xg-falcon-3-port-manifold-vacuum-fitting?srsltid=AfmBOorACJ5X8W-XaLgYH2jcOwa0HH4Fo9mXt5LWlLrd68wGnmAq4S_x

Took my old PCV off and after inspecting , Found the thread clogged up shit.  I don't know the thread size to buy a tap & die set  to clean it out . https://ibb.co/bjcnXLS0

yeah xfalcon was a LONG time ago, 
there would have been plenty of these conversions back in the days before efi was popular, even 30yrs ago i met someone with an escort and megasquirt (assemble yourself ecu kit) running efi bits and pieces for 400hp goal from a 2 litre (he rocked up with a 1300 with efi on it)

most of these low boost turbos of the era are due to the limits of pressure you could run on stock parts (like 4psi not intercooled etc) due to combination of hot air, leaking gaskets and seals or crushing the float bowl..
many were LPG conversions due to a much simpler setup and pollution compliant automatically due to the LPG. 

you can blow through those carby looking EFI conversions .. what you'd save on the tuning costs would probably cover one

http://www.ozfalcon.com.au/index.php?/topic/815-can-a-weber-34adm-be-boost-referenced-and-how/   however I did find a reference to the car and owner here.

Hmmm seems this particular car has disappeared...oh well...

should be able to google the blow through requirements. would be pretty standard, i'd be finding someone who'd tune it and ask what's needed. 
      first google result i found for the carby was on a datsun forum.  plastic float is mentioned,  i don't recall ever hearing about one, but google found this for Me https://www.ebay.com.au/itm/202106654779?srsltid=AfmBOorpSCKBVuVo4LCfd_3xeI4T5NFzXkllCr9Ns4kc__Jnd7WYXu69
first post mentioning the 34ADM below (not much in it really) 
http://datsun1200.com/modules/newbb/viewtopic.php?post_id=414372  

Although that carby hat would certainly do the trick...

Its not so much the carby hat that im interested in as much as how the carb was set up on the falcon and how much boost it ran, I do recall it made more than 250 rwhp.  

the GEMINI owners have used the falcon 34ADM for 20+ years, 

the Carby hat blow through set up is on ebay. LINK HERE
if you find the same one on turbogemini .com, i've heard they aren't good at replying to emails or maybe not at all. so i'd choose the ebay option if needed for buyer protection.   I don't recall a blow through falcon any time in the last 10yrs or so, but there's people doing gemini turbo with the falcon carby still and the also the cortina carby which is different but similar bolt pattern on the top of the carby. 

if you want to do it on the cheap and have fabricator skills, the LPG to Impco 300A adaptor has been cut off and 3" alloy tube welded to it, making a similar carby base to center bolt as below 

A long time ago in an internets far far away...   I saw a clean maroon XF falcon with a Blow thru ADM 34 turbo setup on it on the Xfalcon forums...   Does anybody have any info on this car?   I remember the owner even had posts regarding the custom carb hat and other bits and pieces.