Ran 15.66s 1/4 mile @ 85.8mph on a Dragy GPS device today. 55F.
This is 0.1 sec and 1 mph faster than at a real 1/4mi strip last fall.
-78 1800, Dual 44IDFs, header, 40-80 cams, 2L head, head work, 10.5CR, LSD.
I believe the cams are limiting power. I have bigger cams waiting for installation, been lazy.