[Cheesehead]

In the trunk/boot. The surge tank is small, it contains not more than 1 liter. Any surge tank will do, as long it has enough connections for all your fuel lines and fit the connectors you want to use. I bought one locally at a racing shop. I have also seen this in the wheel well (this is the english word, there is a more correct word for it. Can't remember right now). There is enough room, but it might be a problem if something happens to your rear tire.

The pre-pump is a Carter. I had an old, but still very good one laying around and used that one. I think any pump for a carburetor will do (maybe an intank-pump is the best). You have a return line from the surge tank back to the main fuel tank, so don't worry to much about its capacity.
It is wired parallel to the EFI pump. So switching on the EFIpump also switches on the pre-pump. Works for me. All problems with acceleration and hard cornering were gone.

Chris