Excaliber, I'm aware of the solid lifter-only 427s, but all small blocks displacing 289 and above do have the
oil passages for hydraulic lifters
afaik. Also the only blocks with longer lifter bores are 5.0 roller blocks to my knowledge.
You're right it says the lifters can be used with 1960s blocks in the Summit link, however I don't know for sure if a smaller base circle cam has to be used. And I'd rather not find out the hard way
