Trick flow 240 or 270 for 421 big block

Thanks for all the info! I think the 270s are in my near future then, i was just worried about port velocity but they seem to be a very well thought out head. Ive heard a couple guys try to bash them saying that they have valve shrouding issues and couldnt be ported any further because of the pushrod pinch using stock configuration rockers. But they were probably just knocking them before they tried them! Lol