Reliable? Easy to mod? Oh, man.
I don't think there is a more reliable engine than the 5.0. Takes lots of abuse without fuss.
Very easy and inexpensive to modify! With a small investment, you can make a fire breathing monster out of any 5.0 mustang! Excellent aftermarket support, and as the above post states, this message board has some of the best advice out there.
Good luck.
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