If I could make a lid work with the stock or SS hood and NOT hack up the metal crossmemebr I would. I have a used K&N FIPK on the way. I am going to get the results from it and compare it to the rest of my findings ASAP.

 

Update.
Installed the K&N FIPK and it is about 1KPA better with less pressure loss than my AS&M CAI.

All in all I improved my MAP by 2 KPA by switching to a 58mmTB and the K&N FIPK according to my data logs.

52mm TB/AS&M CAI (left)
58mm TB/K&N FIPK (right)
look at the MAP line (pink)

 

For what its worth, on back to back dyno runs with a H/C stock shortblock setup without unstrapping the car from the rollers removing the intake from the elbow(open TB) gave me 2.x rwhp more then with the full K&N FIPK and a dirty filter. Power wise it is pretty much zero restriction on a stock cube build. Tested within 5 mins of last run so no cool down time or any tricks - we were just checking for intake restrictions like you are. It turned out my MAP was going.

Point being, if you are stock cubes then a FIPK is already pretty much overkill On most builds these engines are head restricted, not intake.