W,
Good question. The first edition mostly covered 230/250/292 I6 engines. The promotonal blurb on this editon shows:
Covering Chevrolet's inline 6-cylinder powerplant from its development back in the late 1920s to the Vortec engine of today, this book includes the 194, 216, 230, 235, 250, 258, 261, 292, and 301 passenger car and truck engines.
Still, your question is pertinent for 216/235/261 owners. Maybe someone who bought or who has thumbed through the new edition will post information.