340 Cam Kits which ones work with a stock block

If you want an idle it needs to be on a tight LSA and can be low on lift so that part of the equation doesn't even matter.

232-235 on a 106 would chop it up and low lift would allow for a single spring and sub 500 lift. You mention that the 226 at 050 cam in the 440 was soft on idle, you need to step up the duration and tighten the LSA to get a choppy idle. People suggest cams with a lot of lift and that's not necessary for what you appear to want.