b18hondahb

okay so i have a 88 dx crx and a 93 4 door civic the crx has a stock motor in it and runs but the 4 door timing belt went out in it. What do i need to put a b18 in the 4 door and a b20 block with a b18 head in the crx? also which combo should I use for the crx like(b20 a,b,z? and for the head b18 ?) I want to get as much power and speed out of the combo motor for the crx so what else should I do to the motor? nitrous, turbo, supercharge? please give me some ideas? thank you. i trying to learn as much as possible about the hondas and acuras.