There are quite a few heads that will outflow the AFR's....however they will be Yates based heads with huge ports or fully CNC ported heads.
And you're absolutely right....to get the big port volume and flow rates, you usually lose the low/mid lift flow numbers.
Also keep in mind that advertised flow numbers are just that. I bought a set of Trick Flow TW-R heads to go on a 445 ci Windsor. They were advertised to flow 340cfm. On a real flow bench, they flowed 320 and I had to port them to get the 20cfm back.
