That's what I did the first time when I put the 3L in my 95 SE. I now have the same motor in a 98.5 SVT. No need to change the lines.
As far as how long you need them, just measure how much you're short now and add a little more for engine movements sake.
IIRC, I made each line about 1.5 feet long or so. But that was 3 or 4 years ago.
