Replace it if you want to, but the Holley isn't suppose to make black smoke either. If it is doing that there is still something wrong with it and it can be fixed. If it wasn't right for that car, it wouldn't have been put on it in the first place. Paul In a message dated 1/16/2004 7:09:33 PM Eastern Standard Time, bobsmopar@xxxxxxxxxxxxxx writes: > Hi All. > I want to replace my holly carburetor on my 68 Imperial what carb, will fit >on this car without a hole lot of modification. > The reason I want to replace it is the black smoke that will not go away. > I bought a rebuilt on and had it put on and adjusted it was > fine for a while but then it started doing it again. > Thank you. > bob > 68 Imperial convertible