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Just in case you miss it, the BT heads have raised exhaust ports. So since high rpms and headers aren't part of your "street" build, the BT heads will probably be too much.
Also, you should look into it, but I think the Shelby heads may require a specific rocker arm/assembly system. I'm not sure Ersons or T&D's will work, but check it out before you believe me. I'm no expert.
I wish other head manufacturers like Dart, World, Brodix, etc. would come to market with an FE head. Maybe soon.
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