I helped out mike on the goonies project and created the custom rom files for custom text and i am also creating a custom set for the evil dead game. I could create a set for your gta game if you want to alter the text displayed during the different features to
I am also working on new plug and play sound boards for 80b games such as this one
which can play original or new sound effects, speech and music, is instant boot and requires no playfield modifications. You just swap out your old sound board with this one and add a series of sound files onto the sd card