Good afternoon all from a new member.  I have a very good running 239 EBV in my 55 F-100.  Got the body almost done and working on the suspension.  Already converted to 12V and just have the cab and gauge cluster to finish up.  What I need help on is the motor.  I am getting a tremendous amount of conflicting data on whether there are any after market parts that fit my 239.  Specifically, I want to know if there are any intakes that will fit.  1X4, 2X4, or 3X2.  Most of the sales stuff only lists the 292 and 312 but some advertise fitment for the entire suite of 55 Y-blocks.  Same question for the exhaust.  I want to remove the cross-over and put on dual exhaust.  Are all the y-block headers universal to fit any displacement?  The motor really runs good and I'm not looking for a hot rod so I am OK with keeping the 239 and the limited performance improvement that may result from these 2 upgrades.  Appreciate your input.  Rick.