What is a 361 big Block ?

MopaR&D said
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

See the pic of the car in my avatar? It is a 503is CI based on a 361 that came out of a 2-1/2 ton dodge flat bed truck. Runs nines.