318 to 390 stroker

The Icon's have 2 choices... where I went 1st. 5 and 23 cc dish+eyebrow volume is quite a spread as noted. I looked into SRP, JE, Wiseco, and DSS. For the rather high cost of the Diamonds (around $800 from Campbell !), you could get some custom pistons made.

Or perhaps mill out some shallow dishes in some of the Icon flat-tops with the same or less $$ versus milling heads and block. A .060" deep dish will add 4-5 cc's; the piston crowns would have to be checked before doing this but I suspect they are thick enough for that amount of milling. You'd end up with the 10.5-ish static CR range, right where you want to be. That might be the simplest solution

As far as the cam, again, it should be chosen with your use, the stroker app, and heads in mind. I am just making what I hope is a good guess. You could look at the cams used in 340 and 360 4" stroker builds to see what has been used; 390 to 408 to 416 will all share the same basic characteristics.