Recommend somewhere for me to buy a 350 long block

[Lifted07Duramax]

Ive been looking on ebay and there are way too many companies to choose from and the price range is like 1500-5000 obviously depending on what comes on and in the motor.
Im looking to spend 2-3k
Im contemplating on buying a 65 chevy truck with a 350 in it. So I can probably use the intake manifold off of it among other things.
So Im thinking all I need is a long block? But Id defintely like one with a new timing chain and cover and all that.

So please recommend a site that sells good motors and good prices and has great customer service.