Well, the explicit demands of the 1958 coup was to put him in place, and in that sense it did succeed - now, whether or not he participated in the planning of it is basically a mystery, but it does seem plausible (even though there is, to my knowledge, no proof of this) simply on the basis that he was the direct beneficiary of it.

Additionally, during the 1958 coup itself he did basically give his support for it in the sense that he explicitly said he was "ready to assume the powers of the republic" if asked for (which is what the leaders of the coup demanded be done).