New Build Advice Needed

Thanks for the input and advice. My head is swimming with all this.
And on top of that have my 69 big block car up on the lift tonight because my 02 sensor on the Sniper was fouled. I suspect exhaust leaks. Is it possible to have fenderwell headers all go into a collector and NOT have an exhaust leak? Hmmm. My forays into the modern world aren’t going so well. Ha