Engine buying

I would go with a factory crate engine --- http://www.fordparts.com/Products/PowertrainProducts- RemanufacturedGasEngineAssemblies.aspx

A used engine is another option.

I thought about a used or rebuilt engine because it is usually cheeper. For some reason though I am more drawn to the thought of a factory crate engine.

I am not sure if you can buy a factory engine fully dressed with everything you need or not but that would be my choice. The factory crate engines have a good warranty which a used engine won't have.

With a long block engine you will have to buy a lot of parts to make it work - intake, exhaust, injection etc.

So where is a place I can buy and engine that runs that I can just drop right in without any problems or have to buy any extras to get it to work?

I would check out the Ford factory engines. The link is in the first post.