Engine Combo's that turned out terrible?

My 1st 360 build KB107 flat top pistons, x heads, 280/474 cam. 727 and an economy Dacco 10" 2600-2800 stall converter. 8.25 rear with 2.45's! Bad combo for sure. Converter slipped quite a bit because of gears. Once @ say 2900 to 3000 rpm it would start pulling. Later added 3.55s and it was all well.