For the purpose of allocating taxes pursuant to Section 33670 and subject to the provisions of this article, redevelopment project areas under the jurisdiction of the redevelopment agency of the City of San Bernardino, for which redevelopment plans have been adopted pursuant to Article 5 (commencing with Section 33360) of this chapter, may be merged, irrespective of contiguity, by the amendment of each affected redevelopment plan as provided in Article 12 (commencing with Section 33450) of this chapter. Upon merger, the provisions of subdivisions (a) and (c) of Section 33413 shall apply to the project areas merged pursuant to this article and the redevelopment agency shall use all reasonable efforts and all available subsidies to implement the provisions of subdivision (b) of Section 33413. Each constituent project area so merged, including, without limitation, those previously merged pursuant to this section, shall continue under its own redevelopment plan, but, except as otherwise provided in this article, taxes attributable to each project area merged pursuant to this section which are allocated to the redevelopment agency pursuant to Section 33670 shall be allocated, as provided in subdivision (b) of such section, to the entire merged project area for the purpose of paying the principal of and interest on loans, moneys advanced to, or indebtedness (whether funded, refunded, assumed, or otherwise) incurred by the redevelopment agency to finance or refinance, in whole or in part, such merged redevelopment project.