Can a stock fuel pump produce too much pressure?

I did rebuild the Holley from the car and while it idled fine, it sputters a bit under a load. No flooding.
I changed the primary metering block, the only one it had. It runs a bit better but still not perfect. Maybe there is something embedded in a passage or something. I did soak it in Chemdip but it is the California compliant stuff. Maybe it wasn't good enough.