Was thinking about going with a 4lb lower
I ran a 4lb lower with a 3.0 upper @ 21psi I made 635 rwhp and 595 rwtq SAE not inflated STD numbers.
the rest was the same as yours combo wise
^ there have been thousands and thousands of cobras with ts's and uncaged lowers with no issues. Unless you're running a 4.0 whipple there's not going to be enough pressure on the snout to ever cause issues.