Stop in for a cup of coffee

Unconventional said
If the smaller and more congested Eagles flow like that, what do those wide one earlier heads flow? Visually speaking to the differences that is.

you have it backwards, the eagles are the bigger, wider ports.

the early 5.7 head, which has a 2.00 inch intake valve, a 1.55 exhaust valve and the smaller ports flows

max of 264 cfm intake, 166 exhaust

the eagle heads have a 2.05 intake, 1.55 exhaust valve but the valves are also much longer, they flow

334 intake, 184 exhaust