One thing I'd try next time out is leaving just off idle. Sometimes a tighter converter will 60 foot quicker being smacked WOT from a low rpm, like 1500 or less. I know mine in the past have.
One thing that surprises me is that it doesn't want more RPM w/ those heads and fairly stout cam.
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
| 
