Bent firewall = AC leak?

When I bought my LX back in 1997, I never really used the AC. When I would use it, the cond. drip would not drip outside, rather in my car. I could hear it, and when I would make a turn (for example to my right) all the water would rush in on my feet. So, I took it to a shop and they told me that the firewall was bent from a previous accident. They told me it would cost a lot to fix but never explained to me what exactly needed to be done. I ended up disconnecting it and it has been that way for years now. Has anyone heard of this or have an idea of what needs to be done to fix this. This isnt my daily driver anymore, but I may go back to it full-time and will only do so if the A/C works. Thoughts anyone? Thanks.

J.R., Where is the evaporator core and is it somewhat accessible?

Nice, thanks for the link. I will definately use this when I get started. Looks like I got a little bit of a project on my hands. Has anyone, mechanically inclined or not, done this and if so, was it all that bad? And, from my first post, does it sound right that the mechanic said that my firewall was "bent" and this was my problem, or does it sound like I just need to do the fixes that have been suggested? Thoughts? Thanks guys.