if you want to Rev higher then you will need a vtec head or a Vtec motor...

IMO the LS tranny sucks for anything except gas mileage go with the GSR but not a B16

you dont really need to build an LS that much unless your gonna be running alot of boost..
But if you want to build some stuff like non internals a diffrent Intake mani, up grade your Fuel system, and your ignition system would be a good start...

But theres alot that can be built on a motor...just depends on how much you wnat to spend.