Thinking of switching from M1 single plane to LD340 but LD340 would need to be milled to fit. Is it worth it?

You claim not to know much but yet you have a B3 rocker location kit. You seem like a smart cookie to me. Good luck.
I know a few things from tons of research during my build. The problem is that my memory is real dumb! I'm trying to do better at keeping good records of things for future reference.