I have the claw on mine, didn't notice any gains but I don't drive real hard or do any real racing to give it a good test. I just wanted it for the same reason as several of the others, it looks cool. Any better-flowing filter is mainly going to help in the higher RPMs anyway simply because that's when the motor requires the most air. Think of it as sucking your drink through a straw. If you're just barely sucking on it enough to get a drink then a small one is ok but if you go to a bigger straw you're obviously going to be able to get more. It would also be a lot more beneficial if you have or plan to modify the motor more elsewhere to make more power and require more air.
As far as the earlier post about operating temps, my LT1 typically runs 200-212 coolant and the 220 range for the oil. Your numbers didn't sound all that high to me unless you've got the cooler thermostat installed or something. I've also programmed my fan to kick on at a little cooler temp so it ran a little hotter before that even. Just my two cents on that.