If the bore is 4.4", and the stroke is 4.4", then it's a 268. Period. End of story.
About the only other thing you need to be aware of is the difference between turbo and non-turbo pistons. Non-turbo pistons will stick up about .010" taller than non-turbo pistons. You want a non-turbo engine's piston protrusion to be about .011-.023" above the top of the block at TDC.