U know the small bracket on the drivers side of the upper intake that holds the throttle cable that most people cut or grind off when they put em on a mustang? That one. Never had it. The cables simply came out of the firewall, looped around the front of the intake where there was one of those little plastic push in clips on the coil bracket, and on around to the throttle body. And to 94boosted, I'm not too sure. If ur wanting iron heads i would say these would be the ones to look for on a street application. U could always go for the 4bar gt40p heads but theres the issue with the plug angle and the headers not wanting to clear. The only other real differences between the 2 other than that is the p's have a slightly smaller chamder, like 10 cc's, and a smaller exhaust valve. The headers not clearing was the deal breaker for me. These are supposed to be the best flowing sbf heads ford ever made. I've even been told once ported and polished they would flow better than some aftermarket aluminium heads. Plus at 50 bucks per head and 150 to rebuild the pair I cant complain one bit