You can, I know Miguel (Mazdaspeed2oo35) has done it. And there are several other high HP/TQ builds that have done it as well. Why do you think you need to sleeve the block? These blocks can handle a large amount of power if you build it properly, unless you're also toying with the idea of having a 600hp FS-DE.
The reason im sleeving it is i had a bad builder on my car over here its not like japan were they have alot of knowlegde about building cars. So i had to work hard on my car to find a way to build my car and keep the it from failing. So my friend said we should sleeve it just got the block back today looks really good