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The effects of molecular weight distribution on the self-assembly of lamella-forming AB-diblock copolymers with polydisperse A-blocks are examined using the self-consistent field theory applied to the freely-jointed chain (FJC) model of polymers. The experimentally observed domain spacing and order-disorder transition point are well described by the theory. The excellent agreement between experiments and theory indicates that the FJC model is capable of describing the phase behaviour of low-molecular block copolymers. A combination of experimental techniques and theoretical modelling offers exciting opportunities to engineering desirable block copolymer morphologies using block copolymers with designed chain length heterogeneities.