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Well depending on the head casting there was not much difference between the GT and std FE heads. The GT exaust bolt pattern was different and maybe a slight chamber cc difference. Valves were std...

Steven, The D2-AA truck FE heads are the same exact casting as the C8-H except for the induction hardened seats in the D2's. C8's were used on lots of 352,390,428's and were Ford's bread and butter...

Don't forget if your swapping to a bigger cam match the valve springs to it. OEM springs,retainers,locks were for the most part desgined for under .500 lift. Some 427's being the exception here....