And I am pretty certain the bike is meant for 27" wheels. The front sidepull brake caliper (Dia Compe 500g which I believe to be original) could not possibly work with these (cheap, chromed steel) 26" rims. The rear, center pull caliper (which I believe was replaced to make the wheels work) lines up.
Also of note: A Suntour NSL High Normal front derailleur!