The corporation shall not pay benefits guaranteed under this subchapter with respect to a plan described in the preceding sentence unless the corporation finds substantial evidence that the plan was terminated for a reasonable business purpose and not for the purpose of obtaining the payment of benefits by the corporation under this subchapter or for the purpose of avoiding the liability which might be imposed under subtitle D of this subchapter if the plan terminated on or after September 2, 1974. The provisions of subtitle D of this subchapter do not apply in the case of such a plan which terminates before September 2, 1974. For purposes of determining whether a plan is a plan described in paragraph (2), the provisions of section
1348 of this title shall not apply, but the corporation shall make the determination on the basis of the date on which benefits ceased to accrue or on any other reasonable basis consistent with the purposes of this subsection.