I suggest you check out http://www.corral.net and http://www.stangnet.com . They have a TON of info on different combo's. IMO, the F cam isnt a good choice for a HCI 5.0. Id go custom but if you are set on the letter cams, id go with an E cam.
EDIT...
even better yet, go with a trick flow package.
http://store.summitracing.com/partdetail.asp?part=TFS%2DK514%2D360%2D350&autoview=sku