First off - 1989 240SX Hatchback -
Anyways, I am in the processes of tearing it apart right now to strip, repaint, and refurbish the entire car.

I am currently trying to do some research on motors. I have it narrowed down to the S13 and S14 SR20DET. So there is my first question. I understand the S14 "Notch top" is more linear and makes more power out of the box. But from the readings i've done it seems the S13 has more potential if you start putting money internally. The main purpose of this car is a street and weekend track car. I have a daily Integra and my S2000. Which in y'all's opinion would be the best choice? I can't see much other than the S14 having smaller ports and VVL? Thanks.
Secondly, I have found several sources of motors (the old motor source threads I find are all very outdated and some shops like heavy throttle have closed).
http://www.shopjdmstar.com/
http://www.sr20store.com/
http://www.jdmenginescorp.com/
http://www.teamclockwork.com/
http://www.jdmenginezone.com/
http://www.jgycustoms.com/
http://www.jspecauto.com/
I have shopped Enjuku a few times before and some one said they sold motors but i don't see them?
Please give input if anyone knows a good source thanks!
And obligatory pics or it didn't happen. Here is my s2000:

