I doubt the flange is the same. I would be suprised, though, if it was.
I guess you might be able to weld the CA manifold to the KA flange if they lined up right, that could possibly work.
They made alot of single cam 240's, around 126,000 of them I think; so there might be some manifolds still out there. Maybe you could just trade the CA manifold for one of those. Good luck!
RT22 wrote:what is the reasoning it putting it on? is there some performance gain?
Yes, there is. It's not the end of the world, but it is more "hot" that the truck manifold. You would probably get 4~6 more hp with a 240sx manifold swap.