New main caps or old

I'm in the process of building a 400-471 stroker with the expectation of about 600-650 hp. I was told the old main caps can handle this (street driven only) or should I get new forged caps and have it align bored. Has anyone here used the 440 source caps since that is where I am getting my stroker kit from. I am trying to consider this a one stop shop and get most of my build from them including their cnc ported heads and 1.6 roller rockers. Any pros and cons on this??? Thanks