I always heard that the stock balancer were not that accurate.(if you even are running a stock balancer)
I would just start at a conservative numer like 12 btc and keep advancing it till you hear a slight ping. Then back it off 2-3 degrees. I have seen Mustangs run best at 11degrees btc and 22 degrees btc and everything in between with the e-cam.
** And yes the same combo with the same compression and the same fuel.**
My 2 cents.
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