Found some rust

I'd go more by how solid it feels. You should be able to get
It cleaner with a coarse wire wheel. I use a wheel on a drill and can often get a better bite by reversing the drill frequently. Epoxy will bond to it and add some strength. Maybe a small metal patch welded in under the gas pedal and coat the rest? I guess it depends some on what the rest of the car looks like. Or, if you just keep your foot on the gas it won't matter...