S13 and an LS3?

[S13andG37]

Hello this is my first post so I hope it's in the right place. I have recently come across an S13 that I bought on the super cheap. It currently has no engine but everything else drivetrain wise is still there. I have a good daily driver that I don't mind at all so the time for this project is more or less unlimited. I've come across a couple of kits and would like to know if they'd cover the extent of what I'd need or if not what else I'd have to get to prep the car itself as well as make the actual swap. Here I've found a 6.2l ls3 engine with 6 speed T56:
http://http://www.jegs.com/i/Chevrolet+Performance/809/CPSLS3T56/10002/-1?CAWELAID=230006180003590753&CAGPSPN=pla&CAAGID=15769068431&CATCI=aud-224375369591:pla-207800042471&catargetid=230006180037475160&cadevice=m&gclid=CjwKEAiAsMXBBRD71KWOh6fcjRwSJAC5CNE1ngg-ZMSyQXWVFn99QoRSoVP8kDkZFgW3vZWsWusaBRoCQ5Hw_wcB
And here a kit for anything I might be missing:

http://www.sikky.com/product/240sx-s13-ls1-swap-kit/

This is my first time building from literally nothing but I'm willing to invest the time and money to learn. Do I need the second kit? Which parts of it? Or does that still not cover everything? I'm also interested in learning about the companies that are selling them and if there are better kits or better deals out there. I've got a nice warm garage for the car and with no engine it won't exactly be going anywhere so I have all the time in the world to get everything together