318 horsepower

Did the same thing for my wife with a 75. We got the original 318 down to 16.4 with boltons before we yanked it in favor of the 360. This 360 was stock except for the same boltons and it immediately ran a 14.5. We changed the rear and tweaked and tuned it to a 13.9 and had some valve problems and a dead cylinder.

Now, valve problems are fixed and new pistons are in to bump CR. Going out next week to see if it will get into the 12's. I get to drive it first then its all hers.

Give me a week to see if it will even run in the 12's , then I can tell you exactly what we have done to this dart to get there.

And welcome to the board!