Not sure on B vans but any header for a small block will fit the A vans. Ive got Dougs D453 and like everyone else mentions essentially, they are nice but you pay for that. Mini starter fits and can be removed with them installed, large Chrysler starter fits but you have to leave the headers loose to install/remove, at least I did. Spark plugs are easy to change, use a short filter but long will fit but will be close to the primary tubes. Tuck up nice, not hanging low so for what it’s worth....