Like 451Mopar said, a GOOD converter will give you your high flash stall but still be tight down low for good streetability. I've been running the same 9" 5000 stall converter on the street since 2003 in my cuda.

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