My MP heads are from the early/mid 2000s and haven't had any seat issues.
The Edelbrock castings that replaced the MP heads have an "E" cast into them on top of the head. They don't say "Edelbrock" on them, just have the Edelbrock font "E" on them. I have a pair of them in the shop...if anyone wants a pic, I can get you one.
Once Edelbrock came out w/ their own heads, they have the full "Edelbrock" cast onto them. That's a whole different head though.
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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