According to Smokey Yunick, on page 77 of his book "Power Secrets" he says, "Decreasing the weight of any of the components on the valve-side of the system would significantly increase the max-rpm limit of the valvetrain; however, decreasing the weight of the components on the pushrod-side of the system did not, in any case we studied, have a significant effect on the rpm limit."
So, having said that, it seems to me that it really isn't worth the effort. But hey, you might see different results. Go for it!