like i said i have a good friend with a 66 barracuda that goes 12.50's.
his combo at the time was:
mid 70's 360 stock bore. just honed. no deck work.
kb 107 pistons. no rebalance or anything done.
stock smog heads.
MP Hemi grind cam (280° Hydraulic: P4452992) in straight up.
open spitfire headers
it does have a good dynamic 9.5" converter.
904 trans with low first.
8 1/4 with a 3.21 gear.
tires were 24" slicks if i remember correctly.
he was running a street tunnel ram and dual 390 carbs at the time of those times.. we did install a performer RPM intake and 780 carb and it ran better, especially down low but never took it to the track like that..