Boosting a Awd crv what block to use

[Sonics01420]

I already have a type R head with turbo and transmission looking 4 block seeing what other opinions are if was n my case I want to put a Ls b18b1 i want to say that block makes more lower end torque but still learning about the guts in side or doing a b20 block but I hear about the walls not great that hold up...