318 to 390 stroker

I didn't see anything from KB that is a 3.94 bore piston. There was a kit out there that had some option for stroker kits but the next jump up for compression from the 9.6 is 11.7. That seems like to much of a jump. I'll talk to the engine builder monday and see what he has to say. NM I'll look into the came you suggested.