wtf
look at this, another ricer wanting to jump on the nissan bandwagon...at least you're not asking about an sr20 and what exhaust will give you 50000000 horsepower.

only engine really is the CA...which isn't really all that great without boost imo, but I've never known anybody to try and build one up NA style.

Rumor is ca and ecu from a pulsar, crank and pistons out of a ca20 200sx, tranny from 200sx or maybe swap bellhousings with the ka.

If you're not gonna turbo though, why not just go high comp KA and use the money you'd spend buying a new engine setup on building the one you got?