I don't think you would notice much of improvement at all by backing down to a 65mm (well atleast not worth the $).
If you plan on getting heads/intake in the future just stay with what you have.
You actually might pick up a little power if you go back to the stock cam too, then again maybe not.
If I were you and if your not planning on heads/intake anytime soon, then I'd try to find someone with a 65mm TB that is looking to go up to a 70mm and just trade them.
What brand is your 70mm?
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NMRA O/C 9516
NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft
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