Substitue Gulp Valve

[Ryan Watson <rswatson@nyx.nyx.net>]

Hello All,

I am in need of a gulp valve for my 1979 MGB. I have been told that the
valves that all the catalogue places sell are actually Datsun 280Z gulp 
valves (or something like that) If this is true, I can get a better price
at my local auto parts place.
Can someone tell me what specific Datsun (Nissan?) Model used the MGB-
compatible gulp-valve?

Also, is there another name for "Gulp Valve?"

thanks in advance
Ryan Watson