I use to think the same thing, Larry…but after all this time it's become clear to me that the LS series engines are trouble free and very powerful right from the factory and some of the chevy crate motors are real monsters. It seems to be a great engine.
Having said that, though, I can think of a large numbers of reasons NOT to use an LS…or a Lexus motor…or a…well, you get the idea. A Cobra replica really OUGHT to have a Ford motor or it ISN't a "replica"…IMHO, of course
Cheers!
Dugly