Slantamousamator blockamousamous question

I have a slant block question. I know the steel and cast cranks have to have different bearings. I also understand the rods between cast and forged cranks are non interchangeable. Now, what about the blocks? Is a cast crank block interchangeable with a forged crank block? Thank you drive through.

http://www.slantsix.org/forum/viewtopic.php?t=41320