The Man!
That said, both of those options are good choices and will render you a very potent 715 with plenty of power and bullet-proof parts. I don't know mych about the 202, but from what I've read it's good......but not as desireable as the 205 when it comes to streetability. The 205 is just hard to beat as a good all around case- quiet, tough, parts are easy to get, and it's tried and true.
About fabbing your own parts- you can with the exception of the driveshafts. You're most likely gonna have to get those made at a shop. If you use the divorced 202, and if it fits close to the same location as the stock 200, then you can use your current shaft.
For the 350's motor mounts, use mounts from a '70 Chevy pickup with the 350 in it.
For the 350's exhaust manifolds- you can use stock manifolds, or get headers that sweep back and clear the frame horns.
For your clutch linkage, I think that some have used the 350's pivot ball, but it's almost as easy to just weld up your current linkage to be a stand-alone type.
For the crossmember you may have to weld up something custom, I don't know as I have no idea what the 2wd 465 looks like. I have a mated 465/205 as you have in your Blazer and I stuck that in there. I had to make a crossmember, but it wasn't such a much.
Good luck and if you have any trouble, ask away as a couple guys have done this swap.
-B.
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