Cam upgrade for my truck, '72 D200 with a 360

I can't remember the PN but when I went through my '72 W200 360 years ago I put a DC RV cam in it. Never again. The engine has gobs of bottom end torque. On a warm day, with a warm engine, on level ground I can put it in 4th and pull away from a stop sign without a problem. But by about 4,000 rpm, it's all over. I'm going through the engine again this year and that is one of the first things to be changed. To what, I don't know, but it's getting changed.