Hey Dave, welcome to stangnet.
If you want to spend about $600, quickfuel makes very nice carburetors. The fuel pump? There are all sorts of pumps that you could use from all sorts of manufacturers. Advice will depend on what you intend to do with your engine.
i'll move your thread over to the fox subforum, the guys there will have all sorts of opinions to offer.
Post some pictures of your mustang for us to see.
Good to have you with us.