89-91 sc swap to 96 stang HELP!

I know the 302 would be a cheaper way to go but i have everything available to be now. I just wanted to know if the t5 which is the 5-speed i have now (not installed) will fit the sc engine? should i just take the sc engine and hook my t5 to it or just swap the entire engine and Manual tranny from the sc to my stang?? I think I have a t5 anyways… I bought it from a guy that said it was from a 3.8 stang??? does that sound right?