Legal Issues: Downloading copyrighted material from unauthorized sources is illegal in many jurisdictions and hurts the film industry. Why the 1974 Original Still Matters
While the plot is largely fictional, the terrifying character of Leatherface was partially inspired by the real-life crimes of Wisconsin murderer Ed Gein . The Plot: A Road Trip Into Hell
In conclusion, while I couldn't confirm the availability of "The Texas Chain Saw Massacre (1974)" on Filmyzilla, I strongly advise against accessing copyrighted content from such platforms. Instead, consider opting for official release channels and streaming platforms to enjoy the movie while respecting the creators' rights.
It allows younger audiences to discover the raw power of '70s exploitation cinema and enables older fans to revisit a masterpiece.