By the choice of smiley that you put next to your statement that the panel is Federal Pacific I'm guessing you might be aware of the danger just from that alone, but in case you need any more detail read the following:
Now, if you're interested in what is involved and what to expect this to cost, and I am gathering that you plan to make the prudent choice of having this professionally done, might I recommend reviewing my blog which can be found from clicking the number of blog posts on the left side of this post. I didn't have a FPE panel nor did my service entrance have the problems you have, but I am installing a new main panel, moving my service entrance (currently it is in a bedroom) and upgrading to 200 amps. My blog post has links to a number of discussions I've had here along the way, and I put in a list of materials for a portion of the project.
For my area, the POCO only furnishes the meter, having read through their manuals apparently they use standard meter sockets but formerly had their own meter socket design. I've read some POCO's have their own design and thus provide the meter socket. Your meter socket looks like it might be proprietary to your POCO so it might be provided, but that's just speculation, and you're going to have this done professionally so if you're looking to understand so you can assess your quotes, contact your POCO. I found everything I needed from their internet page using search terms such as "service entrance installation manual"
My current phase of my electrical upgrade project is costing right around $1000. That's materials, no labor. It does also include a feeder and subpanel in the garage, but it doesn't include the new main panel which I already have in place from a previous subproject. I've heard a 200A service upgrade, which is essentially what this would be, varies by locallity but can run around $2500.
Good luck and hope this has been helpful.