Expect to spend a quite few peso's as there's no manifolds you can use - so you gotta make a custom job for intake + exhaust
Plus the head needs machining to lower compression
Expect lots of heat issues to deal with (suggest HPC for everything inc piston tops).
I would advise choosing an engine with a cross-flow head and EFI manifold - less hassles in the long run. 4AGZE (well, maybe?), 3SGTE (is that the right code or is it 3TGTE?), 1G-GTx, 18RGx etc