Think this intake swap will hurt performance?

This is what I would do: Figure out your goal, then talk to a knowledgeable custom cam grinder and tell him your goals and combination and have him grind a cam for your combination. He can grind a cam to make your combination come alive. He can also give you hints on tweaks you can do to really maximize your combination. (Don't be surprised if he hints at a 4000-4500 stall converter)

Unless your car weighs a ton, my slide rule says you are making around 300 RWHP and around 330 RWT. With the right cam I think you can get closer to 360 RWHP and 360 RWT.

That should put you close to low 11s at 118-120MPH.

So what is your goal?