10 sec. 318?
True, but they work real well on 10 second cars. As you yourself know, just about every successful NHRA stocker runs the Caltrac system, don't need much more hard evidence than that. Some of the A-stockers are in the 9s at this point.
4 links are all fine and good but I don't think the OP was about transforming his ride into a back half type of car. $6K won't get you too far in a program like that.
Would be tough to get into the 12's with a 318 for $6K but hey, we'll play along anyway.