Flybox is 100% right, Trust me , My steering was loose when I first rebuilt my 78K and the first ride was freaking TERRIFYING!!!! After I went back to the drawing board, I added all ballz tapered rollers and made sure they were nice and tight.... no more steering issues. You definitely do not want it loose, you're asking for a nasty accident like that man.
The tapered bearings are pretty cheap and work awesome. Just make sure the entire stack is the correct height, they come with a couple different size spacers (fat wahsers). There's a bunch of info on here about it. Be safe man.