I know you’re long past this part but I think before I would switch to a bigger cam, I’d degree the one you have now. I installed a .218/.224 cam from Ken in my 5.9 magnum and I had planned to stick it in dot to dot but
@RustyRatRod talked me into degreeing it and I’m glad he did. I had to set the timing set to 8* ADVANCED to get the cam centerline where it was intended to be. If yours is similar, I think you’ll notice quite a difference just by degreeing what you already have.