WAIT!!!!! The top end that Lexicon is referring to is the upper and lower intake manifolds, fuel rail, injectors, rocker covers, rockers, etc. Don't forget replacing the pushrods and lifters in the same holes and orientation that they came out of. Also, proper torques when reassembling. A manual is good to refer to if you've never done it before and for proper torques and sequences for the manifolds. Don't forget to torque down rockers with the lifters on the base circle of the cam (start with #1 cylinder in compression and then follow the firing order). It is actually very easy.
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'88 Mustang GT-GT40 Iron Head Engine, Kenne Bell SC/FMU, AOD
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