Er ... these were the facts. Have you been doing some thinking yet?
Fun aside, yup, the PortaFlex gives 350W at 4 Ohm, and the cab can handle 600W at 4 Ohm.
My guess is you're asking about the safety of this. Disregard the following if that's not what you meant.
The four 10" speakers should be safe. If you turn up very much, then the safety of the tweeter depends on all kinds of design features. Hard clipping with eventual full output of high frequencies _might_ ruin the tweeter, but as indicated does depend both on the tweeter and on the amp design.
An output of upto 350W should normally (with average speaker efficiency) translate into enough noise for smaller venues, but IIRC, the MB 410 isn't so efficient, so this could be limiting for you. A test or wise words from others here would be needed.