Agree with using the 128 formula for the lobe separation on this combo. IF the heads and springs can accomodate the extra lift, this cam would work well with a custom converter and more gears if you want a big mid range hit. CLE4N 230/235 [email protected], 480/495, 106LC, 2500-6800 Cam & Lifters
If you want to keep the stock converter and don't have a a lot of room for extra lift, what Rob says with the 108 ground to a 106 with this cam would do what you want. DODGE Howards Cams 710991-08 Howards Cams Hydraulic Flat Tappet Camshafts | Summit Racing
If you have room for the .500ish lift (you didn't mention rockers, but if it's got stamped steel stock rockers the actual ratio is probably closer to 1.3-1.4 than 1.5), then this cam with matching springs will work best with what you have ground onto a 106.
But totally agree with making sure the tune up is right first and foremost, too.