IVAN,
I have literally the setup that you have. I went with the Edelbrock 500 cfm 4 barrel and it works well with the other components. I have the stock deep dish pistons, which don't give quite the compression I need to make the most of the 4 barrel but it doesn't have "bogging" problems either.
I think the 390 cfm Holley 4 barrel would be a better match for a mild 292 than the Edelbrock but it seems to be more expensive and (from what I've read of others) more difficult to tune. I know the Edelbrock I have is a gas hog - even with overdrive and 3.73 gears (turning about 2050 rpms at 65) I can still only manage about 15 mpg in a not-so-heavy 1966 shortbed stepside truck!
So if you get the Edelbrock tune, re-tune and tune some more (probably want to go at least "Stage 1" lean) until you get the MPGs down to an acceptable level.
-magic mike-
