The “M2” is the Ede made head.
I can’t say if that head has any more potential than the earlier head or not.
The main benefit with them is the ootb fit and finish is just nicer. Seems like I remember MCH saying their CNC ported versions of the Edelbrock casting were about 5-10 cfm better than the older 110-M MP casting. Don't quote me on that though. I have a pair of the Edelbrock castings on the shelf and they're definitely a nicer set of heads out of the box than my MP castings were. FWIW...I've been beating on the MP castings since 2006 and no issues w/ valve seats coming out. Probably just jinxed myself, lol.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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