There are several ways to accomplish what you want to do, most of them depending on budget considerations, shop facilities available, and how long you want the engine to be reliable. Every situation is different, and there's no "one size fits all" solution.
Best-case scenario- - - -new cam and lifters, combined with a total engine overhaul, new pistons, cylinder head rebuilt, etc. Big bucks and lots of downtime.
Next option- - - -replace all the lifters, do a break-in run, and hope the camshaft survives to establish a new running relationship with the new parts. Possible, but a little risky, less expensive, and it might get you a considerable amount of lifespan before an overhaul becomes necessary.
Replace the damaged lifters and do a run-in to mate them to the cam- - - -if the lobes with the damaged lifters aren't badly pitted or worn, about the same lifespan as replacing all the lifters, less expense.
Reassemble "as is" pitted lifters and all. Hope for the best. Least expensive, also least likely to succeed.
Pick from the above options, pay your money and take your chances. There's no need to get rude or condescending when offering advice- - - -internet comments are worth exactly what it costs to read them!
Jerry
