Camshaft question

I’m wanting to know what is the best source for a cam recommendation for my 340 stroker(416). The cam currently is a bit large in duration for my taste. I bought the car in its current state, with bits of info from the seller/ builder. It has stock converter and 3.23 SG, 10:1 compression, x heads,and a 750 edelbrock carb. The Dart has ridiculous toque and runs strong, but idles pretty rich. I have done very little Tuning on the carb.(checking transfer slots and idle mixture). I could live with the cam, if I could get it to lean out at idle, because it runs so strong.One other issue is slight surging at cruising speed.Thanks, Brian.