what is the greatest achievements you did on your car.

Thanks. But I'm fighting with timing more. (I'm sure it's the fuel difference.) E-85 wants more advanced timing. (Especially at idle) But getting some popping at the top end. I know MANY have seen this. Especially as builds increase in power. But still struggling to find the sweet spot. I'm wondering if I should have set valve timing more advanced? I may try MSD module that's supposed to be able to take a little timing out as RPM increases. (It won't turn ones setup to a variable timing. But this delay module is said to help?)
I'm not much on engine builds but would guess if you got it dialed in right you could shave some good time at the track.