Swap's a direct bolt in, your exhaust manifolds may be your only problem depending on the style of heads on the 350, if the engine really is a new crate, I would think that 500 would be a fairly decent deal, but chances are you could pick up a whole truck that's got a blown trans or something like that for 500 and take the engine out of it and have the truck for parts/to sell, it may be a crate engine and all that, then again, it's easy to say...