valve train noise?

The 273 rockers will hold up well to the abuse. I put a thousand + runs on the same set in a 7000 rpm small block, plus street use. I still have 'em too.

Depending on who did your valve job, you could have uneven valve heights because they may have sunk a valve or two to clean up the seats. If this is the case you may have a couple of lifters with too much preload and the only way to fix it is with adjustable rockers. With adjustable rockers on hydraulic cams I used to run 1/2 to 1 turn preload(.020-.040), with 1/2 turn being just a touch noisy.

What kind of condition are your valve guides in? A worn guide will give some noise too.