He shows those same Eddy heads (the heads on the EM video 408 vs 408) on a Roadkill short video on the Motortrend pay channel, epoxy filled and relocated pushrod hole, the drill fixture he patterned off of W2 heads, and mentions they made 600 hp on a solid roller 408.
OOPS!, not the 408 vs 408 Eddy heads (my duh!), the ported Eddy heads on this current EM video are the ones he shows on the Roadkill short vid I mention above.