Plenty of pics on the following link, shows how to convert a 3 to 2 circuit and why.
http://www.motorsportsvillage.com/forum/viewtopic.php?f=6&t=3742

Lots of info here.
http://racingfuelsystems.myfunforum.org

This was a 1250 I put together for a customer, showing details of the build.
http://racingfuelsystems.myfunforum.org/viewtopic.php?f=25&t=92

Some of the work I do.