Please help.  I currently have a 1987 Dodge Dakota, and I just got a 4 bbl. manifold and a 625 cfm carburator.  But I'm looking for a set of headers for the 239 v6 motor, but I can't find them anywhere. Does anyone have an idea where I would be able to find it?  I was thinking about taking the headers from the 318 and cutting one of the pipes and welding it shut, but I would rather get the correct part if at all possible.
    Also, I would like to change the gears in the rear.  Does anyone have any recommendations?  I figure you guys would be the experts and would know of a few tricks.  Any information would be appreciated.