Jeff...There was a thread quite some time ago about air pans. I do believe there was results posted. Did you try a search in the race forum?  I did. Couldn't find any results. Might have been more than 2 years ago. I consistently picked up a tenth and 1-1/2 mph on my A12 running in Stock Eliminator and SS when running the factory baseplate.  I used to have a six pack hood on my cuda years ago. Sealing it to the carb was worth a tenth and 1.5 mph, but that was on a mid to low 11 sec combo. There's a lot more air flow across it at low 9 sec speed! Won't know until you try it, but I'd bet it helps. Then this tidbit...the 5" cowl hood that's currently on the car matched the other hood's best ET and MPH...and the cowl wasn't sealed to the carb.
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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