I had a buddy make the following changes and he gained 3 tenths in the 1/4... NO OTHER CHANGES.
His car is comparible to yours... a 1967 barracuda with a 400 running 11.7 to 11.4 with the change.
...From a carter mechanical like yours with stock 3/8th line to a Mallory 140 and -8an line.

I am a big believer in making sure you have enough fuel... I personally dont think the mechanicals can keep up... but I know there are others who think they do.

Did you have the tank in or out to weld that sump in? And what did you do with your sending unit???
Looks great... I'm very interested!!!
Thanks

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http://www.fordmuscle.com/pics/Thord...DSC7192-01.jpg

11.65@120 WITH 1.68 60'
Going for the 10's!