Bookmark this page:
https://www.therangerstation.com/tech_library/index.shtml
Look in the Engine or Conversion section, for the Ranger V8 swap articles, there are several, exhaust is addressed in most
Any of the factory manifolds are TUNED, so they are "headers", they are tuned for mid-RPM scavenged power, many want the lower RPM tune which most 3rd party header provide, avoid "racing headers" they are tuned for high RPM
Need to relocate oil filter as well
You can use older 302 manuals and transfer cases(can't use Ranger transfer case), most have the trans shifter coming up too far forward so shift arm hits the dash, it can be custom bent to work, just a little HEAT, lol
For a better fit a 1997-2003 M5OD-R2(M5R2) 4x4 trans with transfer case from a 4.2l V6 F-150 with fit better, shifter is in the same place as your current Ranger shifter
The 4.2l V6 uses the same windsor bolt pattern as the 302, so bolts right up, need to drill out the bellhousing holes 1/16" because 4.2l used metric bolts, 302 use SAE so just slightly larger diameter