11.50 slant six

Normally aspired, I would have to say not likely. A lot would depend on the amount of work you could do yourself (Head work would be critical), and the weight of the car.
With power adders, definetley possible. My 66 Valiant has already gone low 13's, and the whole car was built for about $1500, including buying the car. I now have about $2,000 in it. There is still a lot more in the car. Last Saturday, I made a 1/4mile pass that was.
60ft-1.768
1/8 8.29 at 78.88 mph
1/4 13.735 at only 78.30 mph, Had a bad shimmy/vibration in the front end, so let up way early.
Link to the build

http://www.slantsix.org/forum/viewtopic.php?t=11218
Charlie is the master of slants. Glad to hear his opinion on this