Headers vs 340 manifolds

headers on a stock 340 through mufflers aren't going to gain anything noticeable.
3/4 cam was a cam ground specifically for the rpm operating range on 3/4 mile stock car track which would have
no low rpm requirement....or maybe a cam with 12 lobes?

I’m not insulting you when I say;

This is the biggest bag of bullshit you have ever read in years.
If anything, it shows that you are absolutely clueless and have zero idea of what you speak of.