Probably none of them. You'll probably find it was a 4CU. The 14CUX was from the later hotwire system and is remappable; the 4CU is from the 'flapper' system and isn't remappable as such, although some tuning can be performed.
My 4.5 seac has a 14cux and I've had it remapped and a different chip to get more air and fuel in and smoother running , and believe it or not more miles per gallon too .
My 4.5 seac has a 14cux and I've had it remapped and a different chip to get more air and fuel in and smoother running , and believe it or not more miles per gallon too .
Is that original or was it converted to hotwire? If original I guess a very late SEAC?