Hello Surfer44,
Welcome to our obsession......The recommendation above to go to Cobra Country is good one... dealing in the world of the E-bay auction vs. an owner or builder that has a finished car in the price band you are looking will get you gratification sooner rather than later.
The cars you will find at that price will be good, well built FFR roadsters, Shell Valley and possibly older Uniques, Everett Morrison. These cars will typically be small block Cobras.
BTW since you are in Nevada you could stop into the Superformance dealership there.....I have seen used cars go out of there complete, licensed and in perfect shape for $35k-$38k a little higher than the price point you mentioned but, solves the donor issue.
Best wishes and Good Hunting,
Tony R.