727 or Powerglide?

I am trying to decide what trans to put in my 72 Valiant. It has Super Stock springs under the frame rails, with sliders and ladder bars (typical Super Stocker setup) and mini tubs (10.5 in slicks). 8 3/4 w/4.56

I am building up a stroker smallblock with a blower.

I am thinking that a Powerglide might work better with the flat torque curve. The 727 is a lot heavier with more parasitic loss, but is a 3 speed.

Anyone have any experience with this combo, or any insight?