i need to know if the 376 cubic inch motor is just a bored and stroked 350
Are you talking production engines?
Are you talking GM production engines?
Did you make a typo when you typed “376” meaning to type “396”?
The 396 is not a “bored and stroked” 350
Some odd aftermarket displacements can come from stroked 350’s (383 being common)
Aim your attention towards “big block” and “small block”