I would think the difference between our 60' times is the convertor and gear, and your superior lsunching skills. My best thusfar is 1.67, and I've read that 1/10 on the 60' is good for 2/10's on the quarter. So, if I figure right, if I geared and stalled like yours, I may get to 12.0 from 12.25. I suppose the rest is engine differences - cam, compression, heads, and whatever else different you did in block prep. Suggestions?