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?)
There's some interesting info around here on plumbing in a vac advance below the throttle plates to get the extra advance at idle without kicking the starter. When you lay on it, the vac advance falls off to help the top end. Just a thought...Who knows?