Stop in for a cup of coffee
the eagle heads are the ones that flow over 330 CFM factory... in comparison, the trick flow 240s for a 440, flow 280 out of the box. Now furthermore, the eagle head is the one where they started pining the valve seats in so they stopped the valve falling issues Dave was talking about the other night.
but notice the intake port shape differences?
check this out on that one Dave decoded for me in the foreground as being a 2006 300C engine.