Hi Bob,
Your 75 roadster is one of about 6000+ or so built and should be saved. Chrysler did not produce any shop manuals for their cars, but the Model 75 "Owners Manual" provides a wealth of information, although not specific to the roadster. The AACA Library is also a source of information although they don't have much on the 1929 Model 75, and the National Automobile Museum in Reno is also a good information source. Though parts are scarce and roadster parts are almost non-existant, Jay Astheimer,
astheime@ptd.net, specializes in early Chrysler parts and has been a valuable and reliable source for me. Before he came on the scene there was nothing but networking and word of mouth to locate parts.
Steve