Are you using the 2bbl throttle bracket? I use one on my 1970 Lemans and it was getting but 1/2 throttle, just enough to crack the back barrels on my Q-jet. I didn't read through all the comments but what gear and stall are you running. My Ventura with the stock convertor would run 9.80s in the 1/8, changing it to a tight 10 inch convertor picked up to a 9.24 with a 3.23 gear with a 8.4 comp 350, 068 cam adv 4 degrees, stock 4 bbl intake and a Q-jet.
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