You need to use a "tire height calculator" here is a link to one (there are many online)
Tire Height Calculator - Wallace Racing
but by using this calculator, we find that those tires have a treadwidth of 9.65, wich means that your front tires will be 1.1 inches wider than their rims at the tread,(cool) and your rears would be .35 narrower than their rim (not cool) although it probably could be done I wouldn't reccomend it, cuz your rear rims will scuff EVERY time you come close to a curb (they will be "pointY). Your tires should be at least slightly wider than your rims in the "perfect" world. If you are carefull though, you could mount them and drive them untill you could afford new rear tires and get a wider section tire at that time. Good luck. Use that calculator, it is fun. I have been immagining I have the money to buy tires like 295/45/18's nitto 555's for a while because I play there all the time (the calculator site I gave you)
Have fun, and don't scuff your rims!
Bill .
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2005 Torch red, predator 93 octane, K&N filter, Pypes true duals, Eibach Pro-kit springs,4.10 posi 8.8 rear end. GT fanblades with Eagle F1's, GT500 rear bumper/spoiler/front splitter