I can see the interest in a ka head but when I looked in to it it was better value for power to work the Lseries head (for me). All depends on what you want to end up with and the time and effort your willing to spend to achieve it. Isn't the idea of a KA head to help the engine breath and if so isn't running mild cams a bit of a waste of such potential.

Dont know why hung up on ka head but if you want it and spend the $$$$. A guy sold his turbo ka headed l20b on ebay $6k.
Its a lot of coin where personally imho a worked or ported l series head would be fun enough

I wasn't too sure but I thought the ka head lowered compression on a L series. Was going to look into it

Get series 2 bluey motor. No need for high comp pistons.

I want to use a L20b bottom end, ka24e head, mild cam, hi comp pistons and quad carbs of some kind. Hopefully using stuff from my local u pull it

Does the navara box fit in a stock 1200 tunnel? I have one already

Also noticed you chasing a sss 5 speed. They dont like constant abuse behind an l20b. Look for a 71b or 71c from an r30 skyline or d21 navara. Supfatto has a 71c stumpy box I think.

tail shaft length depends on where you mountbtge motor. I paid $160 or something to have mine shortened balanced and new unis. Was a h150 auto shaft from a 120y.

Why l20b? If you get one get series 2 bluebird as they hace flat top pistons pretty much. Put an a87 or closed chamber w53 head and mild cam. With carb s would be nice.
l18 revs sweeter.

I have drum struts. Does that make a difference?

To fit the Stanza struts, you need to change the steering arm so the struts will bolt to it. The steering arm from a Stanza or Sunny will work, BUT you need to change the lower control arm, ball joint & I think the castor arm as well. All of these can be sourced from the Stanza or Sunny. Thats why fitting S13 discs & calipers to the standard strut has been popular lately. No need to change the front corners. Just need to source the adaptors that allow the calipers to bolt to the strut, commonly known as dog bones. Several people on this site have advertised these for sale.