I'm in the process of incorporating all sorts of modifications into the "Frankenstein 216" I'm building, so by the time I'm done, about the only things that will be original will be the block and the cylinder head. That one's intended to be a "Sneaky Pete" engine, with the outside appearance of a bone-stock 216, but having almost all modern internal parts. I believe I can get it up to around 260 cubic inches while maintaining the outward appearance of an unmodified 216. To run hydraulic roller lifters in a 216 block, it would require an external oil manifold to supply oil pressure to the lifters. A late model 235 with a drilled oil gallery would be a lot simpler to modify for hydraulic rollers.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!