What is a 361 big Block ?

Cruisingram said
FYI- the industrial motors you can bore the snot out of and get some serious displacement out of them. IIRC< I bored one to 426 size.

Hmmm... alternative to a 400 B engine stroker? Are the blocks beefed up in any other ways in those industrial 361s? I have read they went on for decades in buses, medium-duty trucks etc. alongside the industrial 413 RB