Just doing a 3L swap on a SVT would net around 200HP/TQ at the wheels.
At over 11:1 CR NOS would drastically increase cylinder pressures. I would recommend a progressive NOS setup. Not cheap, but then again speed never is...
Be kind of a waste to do a total 3L rebuild and blow the motor because you skimped at the end.
Yes a full rebuild. I would not even think about just trying to put the parts together and go...