Lunati cams being phased out?

It might be easier to go from 1.5 to 1.6 rockers.
If you are not trying to add some additional duration?

If there is enough room on your existing camshaft to regrind:
Clay Smith Cams has a camshaft @ around 640 to 650 that I have used in several
of our 9 Second Bracket A Bodies. They are one of the major reasons my cars run
pretty well and have been for the best part of 60 years. They make a lot of their living on working
with the small time Sportsman racers.