His E heads were ported,,,not out of the box. Vince Impastato did them. ( I had mine done there as well,,after Gary recomended Vince to me,, ).
Vince might have the flow numbers,,,if needed.

I used to have his motor "combo" saved on the computer,,,,,,(specs,,etc),,i will see if i can find some of the info...

Maybe Bubba or STEFF or Chuck Millen or Jack Irons can chime in,,,i think they knew his combo pretty well.