I think your expecting too much.

My 318 on 7 lbs with a stock converter, 3.55's, 26 inch Drag Radial ran high 7's. Took 13 lbs to go 7.40... a converter (or transbrake) makes WORLDS of difference in the first 60 feet which is critical in 1/8th mile racing.

11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.

9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.