what to do?
Taking the motor out is not necessary. The gains you will get and the power you will make is dependent on the heads/cam choice. Most heads/cam combos range from 400rwhp - 510rwhp. It is dependent on the setup.
A decent set of heads can set you back $1500 - $3000. A cam could range from $200 - $500 depending on which one you go with or if you get it used.
You are also going to need a decent clutch and a 12 bolt to support these mods.

