Engine Combo's that turned out terrible?

I had a 318 dilemma as well. 2nd motor in my 87 Dakota. Reringed and bearing nice solid 270s cam. Heavy ported 302 heads. I never changed the 3.23 gears and 2200 stall. Ran a disappointing 14.6 at 94 mph. Seemed slow to me for what it was suppose to be. I was young though and probably missed some steps, now that I think of it I never zero decked it.