99 2 door hydroboost brake pedal

[ls2hoe]

I recently acquired a hydroboost brake pedal for my set up. my question is when i remove the old pedal how much do i need to remove to to get the pedal out ? I think when i looked in there there was a welded nut on one side and a plate of some kind blocking the other end. I just want a plan of attack before i get after this.

thanks