Alfetta GTV 2l Inlet manifold - advice requested

[AlfaACT]

I have removed the carbies on my Alfetta Gt, so that I can replace the rubber spacer gasket between the carb and the inlet manifold - they are cracked.
I have located and removed the nuts from the bottom row of studs on the spacers (ie under and behind the inlet manifold)
But the top row, of what one might expect to be studs, appear to just dissappear into the manifold body.
Are these ones dowl pins or are they studs too?
See attached pic - I have circled in red the "studs" and the holes that they dissappear into.

If they are studs, do I need to remove the cam cover to access the nuts or do I need to remove the Inlet manifold? Seems unnecessarily complicated.

Assuming they were dowl pins, I applied a little (not too much) persuasion to separate the spacers from the manifold but they are either still held tight (ie still bolted) or maybe just stuck tight - ie glued on!

Advice, tips or tricks would be appreciated? - I dont want to resort to the bigger hammer!

Thanks,
Peter.

[Jekyll and Hyde]

Remove the intake manifold.  The rubber mounts are bolted from the back.  Stupid idea.

[Colin Byrne]

you'll also need a new inlet manifold gasket

[AlfaACT]

Thanks guys.
So its another step back before I go forward :-(
All I am trying to do is clean/clear the fuel system due to a lot of gunk in the tank!
Uncovering the odd other issue along the way but learning lots :-)
Ciao,
Peter.