I don't think there's any difference...but yes...a quadra jet carb will work on your 292...The most common setup I've seen is the holley 390 with the clifford manifold and a set of tom langdon's headers....good hei's would be either stock GM or DUI...both american made. I've got a 600 edelbrock on my 292...runs fine....mileage I'm not sure about cause I don't drive it long enough to really tell...but it makes for a nice cruise and more top end power with the extra fuel and dual exhaust. I've heard of guys getting almost 18 mpg off of 292's with quadra jets....also an od transmission will really help as well.
