Engine Combo's that turned out terrible?

Here's another one.
73 dodge 4x4, first eng was grate. Fresh built stock 360 with a 3000 stall and .474/280 cam........lots of fun but gas mileage sucked!
Put a smaller cam, and a "less" then stock converter in it.:BangHead: Mileage was much better, still pulled my trailer just fine but........leaving a stop light just plane sucked! with or with out the trailer.