DeTom,
I used Crane hydraulic roller lifters in the 351C buildup I did for my '74 Pantera. NO modifications were necessary to use them in the block.
The lifters are linked together in pairs with a slotted tie-bar. This is to prevent them from 'spinning' in their bores, as regular lifters do (to promote even wear).
They are good to 7000+ RPM, and cost about $400. To me, they were totally worth it!
Michael
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