which cam ??

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IM thinking of buying some new aluminum GT40 heads soon. Im wondering which ones to get. They have the e303 and the x303 turbo swirls (which are like $200 more)

Also how do i choose a cam for these heads. I want something a bit meaner than my stock but nothing crazy. Just enough to give it that mean sound and a few extra ponies. If i get the e303 heads then do i need a e303 cam or how does that work?

Also im thinking of throwing in roller rockers while im at it but i dont know how to choose them ....or which size to get.

Any input is appreciated. I havent touched my mustang in a few years. I have my cobra intake all ready to go but if im going to do that i might as well do the heads, cam and rockers.

I have a 91LX Coupe with the AOD, and 373s

Thanks guys