I assume this is what you mean by the adjuster in the body, shown on a carb on one of Beans' TR7s.
The adjuster screw usually has two orthogonal straight-cut slots (not like a Philips) and, I believe, BL sometimes put an anti-tamper plug in the hole above the adjuster, cos some folk are just mean like that.
But I looked at the AUD 663's I have, and they have the idle adjusters as a setscrew with a slot in the head, through a flange on the body, with a locknut; not recessed into the body. The difference I do know is that some AUD 545s don't have a brass tube on the overflow on the float chamber cap, so you can't fit the overflow pipe. So if the float needle jams there's fuel all over the place.
So I though it might be meaning one of the other later carbs, e.g. FZX 1257, you mean as "later carbs", which I have none of. But Burlen Fuels show that carb also having the idle adjuster as a setscrew and locknut - but they could be wrong of course. So I don't know which later Sprint carbs have the recessed idle screws in the body. But it's not AUD 663s, as these are tagged.
BTW, which bit is it appears to be Volvo?
I admit I don't recognize the plastic clamp on the rear carbs float chamber top, but that's a bit on a bit on a bit connected to the body, not the body.
Graham