What you need is 80 minute CDR's, you can burn 700MB of data on those no problem - 700MB is what a 80min CDR is rated to hold. When you overburn a 650MB/74minute CD you are not guarenteed that it'll work ok. You take a risk when overburning but generally speaking 78 minutes is the limit, other people on the forums will say that they have got more on a 74CDR, It highly depends on the type of media that you are using.
It's worth spending the extra on proper 80min CDR's, The difference is really small.