340 camshaft

Well, now that I see what you're dealing with, the Torker and the 3.55's, i'd probably step up a hair...

The easy pick in my opinion would be the Comp 268...
http://www.summitracing.com/parts/cca-20-223-3/overview/make/Plymouth

If you plan on mostly spraying when you really need the power, this Crower looks really good to me. You can disregard their rpm levels as they are usually geared for the torque range...
http://www.summitracing.com/parts/cro-31241/overview/make/plymouth