Those are the new emulsion tubes he created. He also made new idle jets for weak vacuum(normal with a hotter cam)
my 2.75L engine produces 275bhp with 45dcoes and 37mm venturies and runs close to a injected engine except the difference in hot/cold and high/low altitude.
You can subscribe, give him your engine and dcoe specs, tell him your problem and he will help with a lot of patience and knowledge until it works.