I think they are 6" wide and about a +46 offset (best suited for a 205).. a 225 may rub on the inner frame rail area but every tire is sized different from the manufacture so no one can tell you for sure. Since those are track tires and are likely wider than most 225s I would say the chances of rubbing is a little higher. Also the 205 is slightly smaller in diameter at .8" than the 225, so if you like shorter gearing then the 205 will be best for you since you are not making big power yet. The foot print of the 205 is 8.07 to the 225s 8.86 which is a about a 9% difference, a difference most people wont notice unless they track their car very often. One more thing, a 225 on a 6 or 6.5" width wheel will have more side wall flex and is less desirable for handling feed back and feel. In this situation the only benefit I see in a 225 is straight line. The best thing you can do is just try it out and report back.
BTW if you plan to sell those 225s and are willing to ship I may be interested