Mopar sb 273 rocker arm dual spring question

In my opinion it is not a good idea to compromise by grinding the rocker arms. Buying other adjustable rockers, especially aluminum which are thicker will likely also require grinding.

If you can find another reduced diameter spring and retainer package with the right specs to avoid the grinding that would be a better alternative. You could also look to a geometry kit from B3 racing that typically moves the rockers up and back from their current location.