The Ford Alphabet cams were hot back in the early 90's. Twenty years later there are plenty of other off the shelf cams that are better in every aspect (except maybe price). If you want to spend a little more (around $300'ish) then a custom grind cam will give you the best results. FTI is good to go with. Ed Curtis definitely won't steer you wrong and he has plenty of proven combos out there. Before you decide on the cam you need to decide on the heads. It'd be a shame to get a nice custom cam made up for your GT40's and a year later realize you want to get a set of decent heads and make some real power