The granting of a pardon is with in the discretion of the Governor. You have no right to receive a pardon.
If you want to know if the arrest can be expunged, the answer is probably not. You currently would not meet the statutory requirements for an expungement. The actual court record should be closed.
If you in fact received an SIS you can truthfully state you have never been convicted of a felony offense. If the issue is have you pled guilty, you would have to disclose the fact you did plead guilty to a felony.