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well the cam is a roller cam, has roller lifters rather than hydraulic or solid. and the bottom end is forged internals rather than cast. as far as identifing one, well the easiest way is to pop the hood and look at the intake, says "5.0 HO EFI" on my 95GT.
I believe I just read that they started the HO in 87. But I'm not sure really how to check externally