Can Anyone help me out with some specs on a 4k stream setup for Youtube and future proof twitch...
Dedicated Stream PC 8k budget
What you are looking for seems a bit vague. I take it you are looking for something to both run games on at 4K resolution AND stream the gameplay? If your budget is in US currency, $8000 seems way over the top. You are likely to stop seeing meaningful performance gains long before reaching anywhere close to that budget. I highly doubt you would need something like a Quadro professional graphics card for a secondary system processing the stream, and you almost certainly wouldn't need 128GB of RAM for that purpose.
While it's technically possible to put together a system or pair of systems for $8000, that's probably going to be quite wasteful, and from a "future-proofing" perspective, it would almost certainly be better to spend around half as much now, and set aside the remainder for upgrades over the coming years, as more powerful hardware becomes available. Raytraced lighting effects, for example, can cripple performance when enabled on current hardware, and can make 4K unachievable at playable framerates even on a 2080 Ti. There are only a handful of games that support those effects now, but they may become the norm for AAA games before long, and I fully expect the graphics cards launching a year or two from now to handle them a lot better.
It's also worth asking if you are looking for a monitor or other peripherals, or just the system or pair of systems. As well as what hardware your current system has, to give a better idea of where you are coming from.