Okay to start off I have an old fender squier that i bought used about 5 years ago.

I cannot get the intonation set on the G B and e strings. I can almost get it but if i unscrew the screws on the bridge anymore they're going to pop off.

The neck is a little warped and i think this might be why the intonation wont tune right?

If i press the 1st and last frets and look at the 7th... there is a gap big enough to fit a penny and a thin pick. (It's very much playable) So the question is...

Should i try straightening the neck and if i do will it help the intonation.

(best way i could describe all this : /)

Have you tried starting your setup over entirely using the instructions at Fender.com?