people worry way to much about DL size in the 3-4. if they are strong and can get penetration they will be fine. A&M won the Big 12 based on its defense in '98 and our Dl was 275 at one DE, 270 at NG, and 240 at the other DE. All three of those guys are still in the NFL.
Suposedly one of the reason Bennett was fired from A&M is b/c he was trying to change our 3-4 into more of a 4-3 scheme. He used the 4-3 at KSU.