I do have some 700c rims and could use them but they don't have the class that 27" wheels have, and I have a long reach front brake that will fit right on.

Also my other bike that I want to build up is another Raleigh Grand Prix (76) that came to me as a frame and fork that I am going to build up as a SS with 27" wheels that I built up using some new Araya rims and a set of Shimano hubs that I laced up myself, centering a 6 speed hub as a single speed. This will keep my 2 bikes I keep in the States similar and easy to work on.
This is my stable of 700c bikes here in Cambodia