I've got a stock longblock with a PTE 70mm plenum and a stock throttlebody and it's fine. The extra plenum volume is a good thing. A 70mm throttle body on a stock motor would probably be overkill.
I still have it, I take Ppal and here is a pic of it now on the motor. I might not have a chance to get it off the motor this weekend though. I will know for sure tomorrow If I can swing by the garage and take it off the engine.