the difference is in the stroke. 2.800" - 289 ; 3.000" - 302. I'm pretty sure the bore is the same, but I'm sure there are piston dish differences, if not pin height as well. but technically they should fit in the bore fine.
*edit: Though.... Ford did make some god awful contraption of a de-bored 302 as a 4.0L V8 (or something like that). Had nothing but problems lol.
Last edited by Captain Ledd; February 15th, 2009 at 11:54 PM.