Got a 383, need advice from my FABO brothers

OK, I am picking up a 383 tomorrow, bored .030, new pistons, cam, lifters, assembled, with 9:1 compression.
He is going to give me 915 or 516 heads, my choice, but they need a rebuild.
I also get the balancer, timing cover, water pump, cast iron intake, oil pan, and a really nice engine stand, (I asked if he would add it to the deal and he said ok).
This is all for $700.

The goal is to pull my tired 383 and put it away, and have a potent street engine that runs on pump gas.

So, here is where I really need help:

1) Should I take the 915s over the 516s?
2) Would I get more bang for the buck having the heads rebuilt, buying new heads, or buying aluminum heads? I do not want to break the bank on heads.
3) Where is a good place to buy a timing chain? I honestly don't remember if it was on the engine.
4) I want to buy a new flywheel, bearing, and clutch, where is a good place to get these?
5) Do the 383 cranks all have the ability to accept a 4 speed? I know some Chebby cranks did not.
6) The only place I have found BB motor mounts is eBag, anyone know of another place?

My bell housing broke where the Z bar bracket bolts on, and I have another one, so that has to come out, and I need to do the clutch, now I found an engine, so everything needs to come out.
I am not sure I have the know how to pull the K frame out and deal with the torsion bars, but I have pulled many motors the traditional way.

I am thinking about whether or not I want to pay someone to put the rest of the engine together, or go through the bs of doing it myself. I know it is not difficult, just time consuming and I do not have all of the right tools.

I want to order the parts I need asap, so I can get started, so any thoughts or input it greatly appreciated.