Help with 340 compression + cam change

Well those are very good compression numbers and since you have tried 2 gauges, I'd run with your readings. Says that something is driving up the compression more than is known from the paper numbers: machining, maybe chambers smaller than 70cc or more decking than known, or maybe not those pistons....

But that is all good as it says you can increase the lift a fair degree and/or duration if you like, and still keep the low RPM's stout for the street.

Is your objective to go faster on the strip, or ??? And do want to keep that TC stall speed, or is that an option to change?

If you want higher lift-to duration, then I'd nudge you look at the Howard's cams with the lobes optimized for the larger Mopar lifter size. That gets some really good lift to duration ratio; download their online catalog, and look for the ones with the cam note 15 in the right hand column. Also, they have quite a range of these profiles, many more than are listed in the catalog; you can down load their lobe list, and look for the .903 Mopar profiles. These can be custom ordered through Summit or Jegs and others with a base cam number, profile(s), and LSA.

But if you go higher lift, you're gonna have to look at total lift avialable in places like the retainer-to-guide clearance, check P-V clearance, and also springs if you go with a faster rate cam, like a VooDoo or Howard's.

And 1.6 rocker will do like you think. It won't necessarily be cheap to get reliable ones.