Monstrosity (1963) aka The Atomic Brain

A rich but unscrupulous old woman plots with a scientist to have her brain implanted in the skull of a sexy young woman.

Directors:

 Joseph V. Mascelli (as Joseph Mascelli) , Jack Pollexfen (uncredited)

Writers:

 Dean Dillman Jr., Sue Dwiggins, 2 more credits »

Stars:

 Marjorie Eaton, Frank Gerstle, Frank Fowler - via IMDB 

https://archive.org/details/atomic_brain_1964