Just bought a '90 240SX fastback, five-speed, KA24E.

Question, is there any difference in the KA24E and the DE other than the head and manifolds? I'm new to these engines and I'm wondering if you can swap the SOHC head and manifolds for the DOHC head and manifolds?

Also, do they bolt to the same transmission? I'm assuming so but I'm just curious to know for sure.

Another question, read something about a brown-wire mod for the "sleepy eye" healight deal? Any info on that? Is it just a wiring mod? I know for Explorers you can brown wire the foglights to come on with the parking lights and I'm wondering if it's about the same thing?

Next question, possible to turbo a SOHC KA? Is it even worth it? Would stock components hold any boost?

I appreciate any help, I'm just trying to see what's possible out there and what can be done with one engine as compared to another.

I know some of these questions might be stupid but...oh well I'm new to these engines, I'm used to domestics.