Used Fj20et Or Rebuilt Ca18et?

So here's the story.  My ca18et died in a fiery breakdown on the side of the road (14psi is a bit too much it seems) and I now have two options.  

1:  rebuild the CA with some stronger rods and maybe bore it out a bit.  Good because I'll have a nice fresh engine, I can do some headwork while I have it apart and still relatively easy to find parts for.

1:  Swap in an FJ.  I have access to an FJ for next to nothing that comes with the tranny, uncut wiring harness and engine and tranny mounts.  The downsides are fitting the engine (I have no idea how difficult this would be) and finding parts.

That and the fact the FJ would make a nice spare engine for my Skyline, also I'm not sure if the S12 could handle the kind of power it produces (Over 300hp at last dyno).

Any opinions?  And forseeable problems?  Any help would be great.  And I can give more info if needed.

well, you're crazy. if i had an FJ20 laying around, i'd put that baby in my car in a heartbeat. i'd walk to work for the entirety of the time it took to get it going. put the FJ in!

FJ and never look back

Fj but be prepared to do some work on the thing... I would get stuff from Australia and do some work on the motor first.

Bro, just put a CA20 in it! now thats an engine! just kidding. I agree w/ the rest of the guys go FJ!