The amp can probably handle your 4 Ohm speakers with that much power into 8 Ohms. The question is -how loud do you plan on playing them and into what space? It is a matter of when the amp will clip. Most amps will clip at some point, but many very powerful ones won't until the volume is so great you prolly can't stand it or the speakers give out. Most speakers are sufficiently sensative such that the chance of clipping is remote. I wouldn't worry too much unless your having delusions of granduer.
