^^ wrong info buddy...
S14 and s15 are both "notch top" and come with T28
More info here:
SR20 Differences : Red Top - Black Top - Hardtuned.net
SR20DET Specs
Nissan 240SX Performance Modification/Engine Swaps/SR20DET - Wikibooks, open books for an open world
Nissan SR engine - Wikipedia, the free encyclopedia
read the basic info first there are many info guides for your install, depending on your engine you are getting you might just need to swap the new harness and ECU.
Most likely you got a S13 blacktop if the cover is flat just like your redtop.
Good luck