This is what I'm after! I read about that too long ago. I thought it was a 3.51 crank they used '73 340 pistons on. Even though I have eight of those pistons in the engine I don't think I'd do this but what I'm after is possibly doing it with aftermarket shelf parts. Maybe. Just gaming it out.
Just buy a set of higher compression pistons for your current combo. Otherwise, your heading down a rabbit hole of custom machining, balancing, for a minimal return.