Thats an easy fix, especially if you do it at the same time you pull the head. You can buy a cam from Man-A-Fre with new lifters for about $200 and it will give you a little better performance than the stock cam.
My 74 FJ40 still has the stock cam in it and the lifter lobes are so rounded off it has no top end power. I'm going to be swapping the cam and lifters in it in the next few weeks.
One thing that will help slow down the wear on the new cam and lifters is to run a oil made for high friction engines. Nowadays the only way to get that is to run the oils specified for diesel engines. I run the 15w-40 diesel oil since it has the additives to minimize that type of wear.
Randy Rosetta KDØKWX TLCA #19351 69 FJ40 "Meanie" & 1970 Boss 302 Mustang