Replacement car (Grand Theft Auto: San Andreas)

Decided to download Pak machines 90s Atmosphere Vehicles Reborn. In the instructions they say the Files from gta3img with the help of special programs to replace the files from the original gta3.img file of the game. A special program of selected IMGTools 2.0 and I kind of figured out how to replace the necessary files, however, this pack of cars and there are more than 600 files and the replacement manually would take a very long time. Can not understand how to replace all the files at once ? or can you advise a working pack of cars with the automatic installation, but whatever machine was Lorne, tobish real analogues of 90x