If the shafts you have now look pretty much the same as the 'stamped' shafts it means you have the wrong shafts in it now, that's probably why they are so beat up, the 273 type adjustable rockers wont oil properly with those shafts.
the 273 shafts have what everyone calls 'banana' grooves in them, this means every oil hole has a groove cut in the shaft to oil the WHOLE width of the rocker. Bit hard to explain and I don't have any pix, someone may chime in with pix.
Not only will the rockers starve for oil but you will probably smoke your pushrod cups as well, better try and scrounge the right shafts.