Muscle Mustangs and Fast Fords did a complete head shootout a couple of years ago and all the big names were there as well as a few I hadn't heard of. It was an all SB Ford head free-for-all.
Try contacting them for a copy of the shootout results...
http://www.airflowresearch.com/articles.htm
At the very bottom of that page you will find a copy of the article Schloeprok is talking about. It's a 5-part series, and a wealth of SBF cylinder head information.
Here's the short & sweet on the MM&FF test results of the Group 2 heads:
In answer to your other question, the Edelbrocks should outperform stock 351W heads.
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