Yes, Module E will take a 23C.
Sprint rims: Fiamme red label, Super Champion Competition. Getting harder to find in good condition, unsurprisingly. If you decide to go for something that looks appropriate, then it will have to be silver rather than dark anodised, and not deep section.
For an example build, see http://velobase.com/Velos/ViewExample.a ... c&Enum=226
(Campag Record). Have a look for pictures of what Eddy Merckx was riding in 1976 as well. Bear in mind that "groupsets" were not the norm in 1976, and it was common to mix and match components. Centre pull brakes were still quite common on racing bikes; look at some archive racing pictures.