Just purchased a 87 Minnie that the previous owner had a New Holley 4 bbl recently put on, went to get the rig smogged and the tech said it was running too rich and it didn't pass. When he did the H...
Holley has a catalog of replacement carburetors. You can look up 1987 Ford Van with 460 V8 and there'll be an order number. Also, buried in notes and details, will be "not for RV use." I think they realize the load an RV represents and understand their generic carbs are not designed to accommodate it.