Yep, most crate engines have decent quality but often use mid grade internals. Too often people think they should be pretty much bullet proof and end up with a pile of scrap metal.
Depending what you want and if you are starting from scratch or have some good used parts really makes a cost difference. Money buys horsepower, and pick your PRO wisely they are not created equal and your end product and satisfaction is in their hands
Even some Pro's get overwhelmed at times.