Can you please confirm that you are presently in Ghana, will marry there and will then apply for a spouses visa?
An overstay is one of the general grounds for refusal of a visa under s320 of the immigration rules but because this ground for refusal has been defeated on appeal by persons claiming Article 8 (Right to family and private life) Human RIghts Act 1998 is is now not the UKBA's policy to refuse on this basis.
It is highly unlikely that they will refuse the application on the grounds of your overstay. It would be a reverse of their current policy and you would have an excellent chance of success on appeal, though they would be extremely unwise to refuse on the basis of the overstay.
If you otherwise fulfill the eligibility criteria then you will very probably be successful. Info here:-
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