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can i ally 2 helldrakes with my chaos daemons by any chance with a chaos space marine hq ?

The rulebook is pretty clear on this, and Dakka is not to be used as a substitute, but to point you in the right direction-

Look at unbound, combined arms detachments and allied detachments, what you're asking is legal as one of these, but you'd need to select other units in order for it to be legal in the other two.

It's doable, you take a CSM Combined Arms detachment and have to fill the 2 mandatory troops slot (which can be as cheap as 80 points of Cultists) and an HQ, and then you have 3 FA slots.

100 not 80