I don tknow who made them, but I have a set of headers for a truck 235, full length...found them at a swap meet years ago
Clifford makes/made more than one type over the years. The long tube ones pictured were made by Clifford. Perhaps ****** also made some?
Call Clifford. Not everyone lists everything on their websites. I know Tom Langdon definitely doesn't, for example... Since the change in command at Clifford, they may not be making the long ones anymore. You'll need to call and find out. Otherwise, you may be able to buy some 235 header flanges off of Ebay and then modify a set of 292 headers?? keeping in mind that the older engines are taller, so the 292 is likely to be better to work with than the 250 would be, ***uming the "window" for collector location is fairly specific...