"OUCH"!!!!!! The 216 cam can also be made to fit the later model 235 or 261 engines by shrink-fitting a sleeve over the bearing journals and machining/grinding them to the larger bearing diameter. A roller cam/roller rocker arm "261" of around 300 cubic inches is also on the drawing board, using pistons for a 231 Buick/Olds V6 engine. Those pistons are available as hypereutectic, or even forged variants for the turbocharged V6.
I just made a commitment to buy a bunch of spray-oiler engines, 216's and early 235's that will have those cams onboard, from a guy who is downsizing his stash of parts. One engine has the updraft intake manifold and corresponding exhaust manifold used on cabover trucks, if anyone is in the market for that item.
Jerry
