I beam rods are in theory a better design. Really high end rods like Oliver are I beams.

That said, there are some great H beams out there. I'm running Eagle H beams on a 496 with no issues at around 550 HP. They seem to be good to about 700 HP. Scat is supposed to be good also and I believe the 440 source H beams are OK as well.

If you are running a press fit piston pin, the 440 source I beam may be a good replacement for factory LY rods.

If the pin is floating, I'd personally go for one of the good H beam rods out there or use the ones you have if nothing is wrong with them.