"I have to run 93-94 octane to keep it for detonating."

I'm guessing this is because you paid little or no attention to the squish. With a good tight squish of 0.035"-0.040", you could probably run a lesser grade of fuel without detonation. I'm further guessing that with Vortecs, this motor will rattle like a can of rocks if you don't adjust the squish. Just my opinion.