Which engine do i have?

[dozug]

this is my engine pic, and i dont know if this is s13 red top or s14 red top.

I want to hook up the AC but I dont know which bracket should use (even if i find the bracket kit from other ppl)

so yeah I know this is red top cuz previous owner told me.

so yeah how do i know if which engine is this?

Thank you always zilvia!