Cutting my automotive A/C teeth

Hi and thanks for having me. I am renovating an  A/C system in an old 1974 vehicle. I have updated the compressor and condenser, am making new hoses and using aluminum headlock fittings. All fittings will use o rings except my connections at the ancient but excellent condition evaporator. Those two to the compressor and from the dryer will be flare fittings. I am wondering if I should use copper flared washers and whether or not the dissimilar metals is going to be a problem. The fittings from the hoses will be aluminum, the expansion valve seems like a different metal as does the evaporator side fitting to the compressor hose. I am planning on using Nylog Blue after reading about it in my searches and am  trying to get this right the first time.  I will be using R134a refrigerant.

Thank you very much for your help. -Scott.

Cutting my automotive A/C teeth

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