Camshaft help.....340 Dart Swinger

Oh good God man! You answered me "Within the quote tags!" RUFKM! Seriously now! Good Lordy!

Would you be willing to change gear ratios and a torque converter?
What size tire are on the back wheels?

The gear ratio and very possibly the converter are limiting the cars performance. I'm not sure a cam alone would do you good for a 100 mph 1/4 mile.