273 Rockers on a 360

You could also have the valve tips cut .030, which makes me wonder about the valve job. IF you are using OEM type replacement valves, and IF the seats are not sunk below factory levels, the rocker contact patch should be really close. You could have the geometry problem you have now if the valves have been set too deep in the head. Not saying this is your problem, but I've seen it before.