Crowers I-beam rods are nice parts. I am using a set of Crower 6.0 floating pin in my stroker. I am also now building a 250 with Crower 5.7 press pin rods.
I too thought about altering small block chevy 2.1 big end rods to run on 2.0 journal. I am well equipped to do machine work so it would not cost me much to do but frankly, I could not come up with a good plan so I gave up and bought Crowers. If you are determined enough I'm sure it could be done.
