**Don't use plaster. Use modern drywall joint compound on drywall installed flush with the plaster.** 

My former 1950s home had the same situation, with 3/8" drywall behind 3/8" of plaster. I describe it as the best walls I've ever owned--very durable and easy to work with when adding outlets, etc. 

Shim out the framing so 5/8" drywall lays flush with your plaster. Use modern taping techniques and materials to finish the joints. Texture as required, prime, and paint. You'll have a flatter surface with much less work than you would with plaster. 

More info:

 - https://diy.stackexchange.com/questions/126572/how-to-repair-walls-which-have-two-layers-of-wallboard
 - https://diy.stackexchange.com/questions/145909/is-this-plaster-over-gypsum-wallboard