Just bought a 99 GTP and the guy that had it before did a few mods.

3.3 pully
level 1 ZZP cpu with cat delete
3 inch down pipe
msd wires
fenderwall intake
gatorback belt
180 t-stat
i think colder plugs
cat and resonator gone
and a butchered up exhaust with 3inch mufflers.

I am adding headers when i replace trans.

My question: Can I get away with that pully or should I get a 3.4?

Also how much KR is absolutly too much? Obviously 0 is best but what can i get way with before it gets dangerous?