If you go here
https://techinfo.porsche.com/techinfo/pdf/en/catalogues/E_911_89_KATALOG.pdf page 408
I think you shoud have as original equipment in an 87 a 911 618 111 20 or a 911 618 111 16 if you have a Club sport (but I have never figured out for sure the model codes).
To figure out what a 14 comes out of you would have to download previous pet files and go through the MSP and V pages to figure out a model code.