Best lifters for my 1965 273

on resurfacing the rockers
no need unless you put in a bigger cam where the valve stem tip would have to ride up on the wear ridge
if that is the case very large forces come into play and longevity is compromised- sometimes very
same problem on the pushrod side
take a look with a magnifying glass next time you inspect old rockers
bvvc jumping to roller rockers
they have to be dialed in as to geometry (easiest is with a B3 kit) or as with drugs- they have "side effects"