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My 78 530 with m90 motor, the head gasket went out I am completely going to rebuilt the engine but in the mean time i want to convert it to the new motronic 1.1/1.3 using the Ljet intake if anybody has info in this let me me know plaese thanks I've been looking for info but still a little confuse

L-jet intake isn't a real problem, the biggest hurdle is making a bracket to mount the fuel rail to. You can mount the later injectors to the L-jet manifold, but they use O rings to seal the injectors to the fuel rail, so it needs to be secured. But that's no biggie.