OK... well um..
First off, WELCOME! Great to have a new member. Congrats to you/your brother for getting a fantastic car!
You are correct.. this is the S13 Chassis.
S13 = 89 - 94 240sx (All 240's come stock with 2.4 L engines)S14 Zenki = 95 - 96 240sx... new body style with rounded headlightsS14 Kouki = 97 - 98 240sx... new body with more aggresive pointed headlights. (very limited production and sales in US)S15 = SEXY... 99 - up Not sold in US. Sold in Japan, AUS, NZ, etc... I include it because you will here people talk about swapping the S15 front end onto their S13s and S14s.
89 - 90 = KA24E... KA is engine code, 24 is engine size, E refers to single cam. 91 - 98 = KA24DE... same as previous only DE refers to dual cam or twin cam as you refer.
You will here often about "T's". That means Turbo. SR20det, CA18det, RB20det, RB26dett (twin turbos)... KA24e"t"... etc..
Here's the deal on 'verts. Sold in US only from 92-94. In 94 no coupes or fastbacks were sold here.. only 'verts. So if you here 94... garaunteed to be a 'vert.
*all 'verts were sold here in the US as automatic trans.
(I put an asterisk there because it is not common knowledge that there was a very limited run of 5 spd sold in Cali only in '92 that a manual tranny stock. They were more of a promo type deal than an actual production car.. I know this because a friend of mine was a GM at a Nissan dealer in San Diego in the early 90's, and he got one as a demo for a bit.)
Here's a link for a thread about the timing chainshttp://
www.nicoclub.com/zerothread?id=65251
So.. now you have the basics.. which are about all i am qualified to share with you. You will certainly have lots more questions. Feel free to ask away. Remember the "search" button on the top right of your screen. There is a ton of awesome info on this board that has been posted, and you will find the answer to most questions there. But, feel free to ask for help here as well.
Thanks for joining!!! Enjoy your/your brother's 240 'vert!!!!