I have a copy of Bentley BR2 by L.K. Blackmore. My copy has all the drawings reproduced within its pages.
Even when I do have proper drawings, I don't use them in the workshop. I make a convenient A4 copy of the specific component I intend to machine, or even just the detail for the days operation.
Incidentally, before embarking on such a project, I like to model the entire engine in CAD. This allows me to fully understand the design and to produce my own drawings, dimensioned to suit my preferred machining methods.
I am building the Whittle Aero V8 at the moment, mostly from my own drawings.