low compression

According to Mopar Muscle, the 906 is a regular passenger car head. The 452 actually beat it out in a couple places. If the 906 was so great, how come Chrysler put them on 383 2bbls in station wagons? I agree the 516 isn't a performance head. Chrysler actually only made one HP head for the big block besides the Max Wedge and that was the 1967 915 head.