speedmaster 440 heads

What length are the valves . I'm thinking about putting 2.3 in mine with a smaller exaust valve like b1 heads do. I'm unsure of valve length.. I just got a set of the unported 265cc without valves. I'd like to find some used titanium 2.3 intakes. And have the bowls blended. Maybe make them flow 320 at .500 or better if possible. I have about .560 lift .
Nothing like resurrecting an almost 8 year old post!