With stockish heads, what you will gain is TORQUE. And lots of it. Not so much gain in acceleration.  And just move the peaks down lower. If this isn't a good effort at a stock appearing type of deal, then I'd have no issue keeping the stock stroke. The stock heads and intake are strangling 440 cubes to begin with. 
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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