Double check my engine builder please 340 stroke

With an uncut deck, these pistons would be .012" in the hole. With a .039 " thick head gasket, your SCR will be around 11.5 SCR and DCR will be around 9.1 .That is for the brave of heart and the best tuning skills. At last in MO, you have 93 octane premium (I assume).

But..... That assumes that the advertised cam duration on the intake side is around 278 degrees; that is a fairly fast ramp cam so is possible. What you really want to know is the advertised duration and that shows nowhere on the cam card. If this cam has a slower ramp, then advertised duration may be up around 286. Then DCR is around 8.8..... still pretty tough run.

I'm a strong advocate of keeping DCR up for street use but this is more than I would go for 93 pump premium. (Low 8's is where I am comfortable.) Change to the IC745 dish pistons, use a .028" head gasket and put the pistons .007" in the hole (to get a quench gap of .035") and now your SCR is 10.1 and your DCR is 8.0. (Again assuming an actual advertised cam duration of 278*) And you have a good quench gap to help fight any detonation.

IMHO, there are other cam choices that will work nicely with the above combo. I'd probably run a step smaller cam with this combination for a bit more DCR and more fuel economy; but that also gets into what you actually want 'on the street'.

And yes, your last set of DCR computations was for the piston .100" in the hole, as MO noted.