I agree with, TheSloAod. You should get a combo of heads and a cam. As long as you have the car that far apart, a cam should be fairly easy to install.
TFS quality issues are BS at this point. They had some problems a long time ago, but that is no longer an issue. As far as them being harder to install, how could it be any easier?
Whatever you choose, plan to stick to a single manufacturer for your heads and intake. They are usually port matched out of the box and will give you better flow than going with a bunch of different manufacturers.
I have the TFS TW heads and a GT-40 intake. If I were to do it all over again, I would still keep the TFS heads and would buy the TFS intake. In my case, the 351 intake. TFS also has cams designed to go with the intake and heads.
Whatever manufacturer you choose, you could probably contact them and tell them what you are shooting for and they can give you a good plan to hit that target.
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351W 89 Mustang GT Convertible