10 sec. 318?
Plan your build BEFORE you just go throwing parts together
If you are SERIOULY considering a blower in the future, then build the bottom end accordingly (like lower compression pistons than what you would have probably used in a NA motor, steel crank, etc..) if this is just a wouldnt that be cool if and it never comes to fruition, then you will end up with a screwed up combo that doesnt live up to its potential.
Sorry, not trying to be a party pooper. Just make sure your head is on strait before you start spending that 5k.