Unless the lifters are damaged don't touch. The lifters wear to match the cam and should only run on the "cam lobe" it was installed in. They are now a matched set in any engine!
The cam and lifters are NEVER replaced separately by any mechanic worth his/her salt!!!
Note, I am now very skeptical of your shop choice and there knowledge.
I would suggest that once you get the taper info you find another shop to check the bores for necessity of a fresh bore. These are a slow turning low compression engine which is far more forgiving to bore tolerances.
Dave Neptune
