Well no passenger car Mopar engine since the early '60s had valve seat inserts in a cast iron head. I doubt that the V10 Ram truck had them either.

Over the years there has been no particular year or years of the Mag heads that were more prone to cracking, and no difference between US and Mexican Mag heads in that respect, either.

To the OP: If you can afford to use a set of Edelbrock Mag heads, go for it. As far as I am concerned, there is no downside to this unless it makes you have to eat ramen.

The Enginequest iron heads are in the middle as far as performance and price.

Get real world prices for the three options before you jump.

R.