I can't imagine why, as long as the engine conforms to all the relevant regulations regarding emissions that relate to the newer model chassis that the older engine is to be used in.

We can now update old engines with PCV systems, modern carb[s] or EFI, & Electronic ignition or even LPG without difficulty, exceding the requirements of an original engine by a wide margin, so where's the problem.

Hell, if we can get an early Hemi or Flathead Ford to run clean, then anything can be fixed.