Anyone know where I can find one of these?

This is a fuel filter that allows more flow as engine vacuum (or blower psi) puts out more demand. From what I understand, I can boost reference the ports, setting this up in the fuel flow after the high volume pump....parts gurus?
Also looking for a 312 crank to cut down to 292 main size...
danaxjessup@yahoo.com
Daniel JessupLancaster, California
aka "The Hot Rod Reverend" 
check out the 1955 Ford Fairlane build at www.hotrodreverend.com