Here's a good link with some LS/VTEC info.

http://www.diyracing.com/2ndpage.htm

Check out the links on the right. Just a word of warning, a factory VTEC engine is not simply a non-VTEC block with a VTEC head. There is a different water pump, oil pump, pistons, rods, crank any many other things. If you want your engine to be reliable, make sure your willing to invest the money to upgrade or replace everything. It will most likely cost you what a VTEC engine would in the end (but you will have built it yourself). Seeya.